diff --git a/messages.pot b/messages.pot
new file mode 100644
index 0000000..82593bf
--- /dev/null
+++ b/messages.pot
@@ -0,0 +1,528 @@
+# Translations template for PROJECT.
+# Copyright (C) 2021 ORGANIZATION
+# This file is distributed under the same license as the PROJECT project.
+# FIRST AUTHOR <EMAIL@ADDRESS>, 2021.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: PROJECT VERSION\n"
+"Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
+"POT-Creation-Date: 2021-03-25 16:51-0400\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Babel 2.8.1\n"
+
+#: scisat.py:263 scisat.py:1553
+msgid "Acetone"
+msgstr ""
+
+#: scisat.py:264 scisat.py:1554
+msgid "Acetylene"
+msgstr ""
+
+#: scisat.py:265 scisat.py:1555
+msgid "Ethane"
+msgstr ""
+
+#: scisat.py:266 scisat.py:1557
+msgid "Trichlorofluoromethane"
+msgstr ""
+
+#: scisat.py:267 scisat.py:1558
+msgid "Carbon tetrachloride"
+msgstr ""
+
+#: scisat.py:269 scisat.py:1561
+msgid "Carbon tetrafluoride"
+msgstr ""
+
+#: scisat.py:270 scisat.py:1562
+msgid "Trichlorotrifluoroethane"
+msgstr ""
+
+#: scisat.py:271 scisat.py:1563
+msgid "Chloromethane"
+msgstr ""
+
+#: scisat.py:272 scisat.py:1564
+msgid "Acetonitrite"
+msgstr ""
+
+#: scisat.py:273 scisat.py:1565
+msgid "Methanol"
+msgstr ""
+
+#: scisat.py:274 scisat.py:1566
+msgid "Methane"
+msgstr ""
+
+#: scisat.py:276 scisat.py:1568
+msgid "Methane 212"
+msgstr ""
+
+#: scisat.py:277 scisat.py:1569
+msgid "Methane 311"
+msgstr ""
+
+#: scisat.py:278 scisat.py:1570
+msgid "Difluorochloromethane"
+msgstr ""
+
+#: scisat.py:279 scisat.py:1571
+msgid "Trifluoromethane"
+msgstr ""
+
+#: scisat.py:280 scisat.py:1572
+msgid "Chlorine monoxide"
+msgstr ""
+
+#: scisat.py:281 scisat.py:1573
+msgid "Chlorine nitrate"
+msgstr ""
+
+#: scisat.py:283 scisat.py:1575
+msgid "Carbon monoxide"
+msgstr ""
+
+#: scisat.py:284 scisat.py:1576
+msgid "Carbon dioxide"
+msgstr ""
+
+#: scisat.py:285 scisat.py:1577
+msgid "Carbon dioxide 627"
+msgstr ""
+
+#: scisat.py:286 scisat.py:1578
+msgid "Carbon dioxide 628"
+msgstr ""
+
+#: scisat.py:287 scisat.py:1579
+msgid "Carbon dioxide 636"
+msgstr ""
+
+#: scisat.py:288 scisat.py:1580
+msgid "Carbon dioxide 637"
+msgstr ""
+
+#: scisat.py:291 scisat.py:1583
+msgid "Carbon dioxide 638"
+msgstr ""
+
+#: scisat.py:292 scisat.py:1584
+msgid "Phosgene"
+msgstr ""
+
+#: scisat.py:293
+msgid "Carbonyl chlorine fluoride"
+msgstr ""
+
+#: scisat.py:294 scisat.py:1586
+msgid "Carbonyl fluoride"
+msgstr ""
+
+#: scisat.py:295 scisat.py:1587
+msgid "Carbon monoxide 27"
+msgstr ""
+
+#: scisat.py:296 scisat.py:1588
+msgid "Carbon monoxide 28"
+msgstr ""
+
+#: scisat.py:298 scisat.py:1590
+msgid "Carbon monoxide 36"
+msgstr ""
+
+#: scisat.py:299 scisat.py:1591
+msgid "Carbon monoxide 38"
+msgstr ""
+
+#: scisat.py:300 scisat.py:1592
+msgid "GLC"
+msgstr ""
+
+#: scisat.py:301 scisat.py:1593
+msgid "Formaldehyde"
+msgstr ""
+
+#: scisat.py:302 scisat.py:1594
+msgid "Water"
+msgstr ""
+
+#: scisat.py:303 scisat.py:1595
+msgid "Hydrogen peroxide"
+msgstr ""
+
+#: scisat.py:306 scisat.py:1598
+msgid "Water 162"
+msgstr ""
+
+#: scisat.py:307 scisat.py:1599
+msgid "Water 171"
+msgstr ""
+
+#: scisat.py:308 scisat.py:1600
+msgid "Water 181"
+msgstr ""
+
+#: scisat.py:309 scisat.py:1601
+msgid "Water 182"
+msgstr ""
+
+#: scisat.py:310 scisat.py:1602
+msgid "Hydrochlorofluorocarbon 141b"
+msgstr ""
+
+#: scisat.py:311 scisat.py:1603
+msgid "Hydrochlorofluorocarbon 142b"
+msgstr ""
+
+#: scisat.py:312 scisat.py:1604
+msgid "Hydrochloric acid"
+msgstr ""
+
+#: scisat.py:316 scisat.py:1606
+msgid "Hydrogen cyanide"
+msgstr ""
+
+#: scisat.py:317 scisat.py:1607
+msgid "Formic acid"
+msgstr ""
+
+#: scisat.py:318 scisat.py:1608
+msgid "Hydrogen fluoride"
+msgstr ""
+
+#: scisat.py:319 scisat.py:1609
+msgid "Hydrofluorocarbon 134a"
+msgstr ""
+
+#: scisat.py:320 scisat.py:1610
+msgid "Nitric acid"
+msgstr ""
+
+#: scisat.py:321 scisat.py:1611
+msgid "Nitric acid 156"
+msgstr ""
+
+#: scisat.py:324 scisat.py:1614
+msgid "Peroxynitric acid"
+msgstr ""
+
+#: scisat.py:325 scisat.py:1615
+msgid "Nitrogen"
+msgstr ""
+
+#: scisat.py:326 scisat.py:1616
+msgid "Nitrous oxide"
+msgstr ""
+
+#: scisat.py:327 scisat.py:1617
+msgid "Dinitrogen pentaoxide"
+msgstr ""
+
+#: scisat.py:328 scisat.py:1618
+msgid "Nitrous oxide 447"
+msgstr ""
+
+#: scisat.py:329 scisat.py:1619
+msgid "Nitrous oxide 448"
+msgstr ""
+
+#: scisat.py:331 scisat.py:1621
+msgid "Nitrous oxide 456"
+msgstr ""
+
+#: scisat.py:332 scisat.py:1622
+msgid "Nitrous oxide 546"
+msgstr ""
+
+#: scisat.py:333 scisat.py:1623
+msgid "Nitrous monoxide 447"
+msgstr ""
+
+#: scisat.py:334 scisat.py:1624
+msgid "Nitrogen dioxide"
+msgstr ""
+
+#: scisat.py:335 scisat.py:1625
+msgid "Nitrogen dioxide 656"
+msgstr ""
+
+#: scisat.py:336 scisat.py:1626
+msgid "Oxygen"
+msgstr ""
+
+#: scisat.py:339 scisat.py:1629
+msgid "Ozone"
+msgstr ""
+
+#: scisat.py:340 scisat.py:1630
+msgid "Ozone 667"
+msgstr ""
+
+#: scisat.py:341 scisat.py:1631
+msgid "Ozone 668"
+msgstr ""
+
+#: scisat.py:342 scisat.py:1632
+msgid "Ozone 676"
+msgstr ""
+
+#: scisat.py:343 scisat.py:1633
+msgid "Ozone 686"
+msgstr ""
+
+#: scisat.py:344 scisat.py:1634
+msgid "Carbonyl sulfide"
+msgstr ""
+
+#: scisat.py:345 scisat.py:1635
+msgid "Carbonyl sulfide 623"
+msgstr ""
+
+#: scisat.py:348 scisat.py:1638
+msgid "Carbonyl sulfide 624"
+msgstr ""
+
+#: scisat.py:349 scisat.py:1639
+msgid "Carbonyl sulfide 632"
+msgstr ""
+
+#: scisat.py:350 scisat.py:1640
+msgid "Phosphorus"
+msgstr ""
+
+#: scisat.py:351 scisat.py:1641
+msgid "Polyacrylonitrile"
+msgstr ""
+
+#: scisat.py:352 scisat.py:1642
+msgid "Sulfur hexafluoride"
+msgstr ""
+
+#: scisat.py:353 scisat.py:1643
+msgid "Sulfur dioxide"
+msgstr ""
+
+#: scisat.py:946
+msgid "Altitude"
+msgstr ""
+
+#: scisat.py:957
+msgid "Mean concentration distribution on altitude"
+msgstr ""
+
+#: scisat.py:965 scisat.py:1216
+msgid "Concentration [ppv]"
+msgstr ""
+
+#: scisat.py:972
+msgid "Altitude [km]"
+msgstr ""
+
+#: scisat.py:1061 scisat.py:1094
+msgid "Gas Concentration [ppv] (mean on altitude and position) "
+msgstr ""
+
+#: scisat.py:1106
+msgid "World graph of mean gas concentration"
+msgstr ""
+
+#: scisat.py:1211
+msgid "Time Series"
+msgstr ""
+
+#: scisat.py:1213
+msgid "Date"
+msgstr ""
+
+#: scisat.py:1513
+msgid "SCISAT Data Visualisation"
+msgstr ""
+
+#: scisat.py:1514
+msgid "Learn More About SCISAT"
+msgstr ""
+
+#: scisat.py:1515
+msgid "Data selected"
+msgstr ""
+
+#: scisat.py:1516
+msgid ""
+"Launched on August 12, 2003, SCISAT helps a team of Canadian and "
+"international scientists improve their understanding of the depletion of "
+"the ozone layer, with a special emphasis on the changes occurring over "
+"Canada and in the Arctic. "
+msgstr ""
+
+#: scisat.py:1517
+msgid ""
+"This application provides users the ability to select, download and "
+"visualize SCISAT's data. The dataset can also be accessed in [CSA's Open "
+"Government Portal](https://data.asc-csa.gc.ca/dataset/02969436-8c0b-4e6e-"
+"ad40-781cdb43cf24)."
+msgstr ""
+
+#: scisat.py:1518
+msgid ""
+"The authoritative source data for the Atmospheric Chemistry Experiment "
+"(ACE), also known as SCISAT, is available on the [ACE "
+"site](http://www.ace.uwaterloo.ca/data.php) (external site only available"
+" in English). "
+msgstr ""
+
+#: scisat.py:1519
+msgid ""
+"Please read this [Important Mission Information "
+"Document](http://www.ace.uwaterloo.ca/ACE-"
+"FTS_v2.2/ACEFTSPublicReleaseDocumentation.pdf) before using the "
+"ACE/SCISAT data. Please refer to the relevant scientific literature when "
+"interpreting SCISAT data."
+msgstr ""
+
+#: scisat.py:1520
+msgid "Visit our Github page to learn more about our applications."
+msgstr ""
+
+#: scisat.py:1521
+msgid "Select Data"
+msgstr ""
+
+#: scisat.py:1522
+msgid "Update"
+msgstr ""
+
+#: scisat.py:1523
+msgid "Update with selected data"
+msgstr ""
+
+#: scisat.py:1524
+msgid ""
+"Graph of the gas concentration in parts per volume (ppv) visualized on a "
+"world map. Each dot represents the mean concentration on the selected "
+"dates, the altitude column as well as the position. The color indicates "
+"the mean gas concentration value."
+msgstr ""
+
+#: scisat.py:1525
+msgid ""
+"Graph showing the gas concentration in parts per volume (ppv) over the "
+"selected altitude interval. The value represents the mean concentration "
+"over the latitudes and longitudes selected, as well as the selected "
+"dates."
+msgstr ""
+
+#: scisat.py:1526
+msgid ""
+"Time series showing the evolution of the gas concentration in parts per "
+"volume (ppv). Each data point represents the daily overall mean "
+"concentration."
+msgstr ""
+
+#: scisat.py:1527
+msgid "Selection of the gas"
+msgstr ""
+
+#: scisat.py:1528
+msgid "Selection of the range of latitude "
+msgstr ""
+
+#: scisat.py:1529
+msgid "Selection of the range of longitude"
+msgstr ""
+
+#: scisat.py:1530
+msgid "Date selection"
+msgstr ""
+
+#: scisat.py:1531
+msgid "Download the selected dataset"
+msgstr ""
+
+#: scisat.py:1532
+msgid ""
+"Invalid values provided. Latitude values must be between -90 and 90. "
+"Longitude values must be between -180 and 180. Minimum values must be "
+"smaller than maximum values. All values must be round numbers that are "
+"multiples of 5."
+msgstr ""
+
+#: scisat.py:1533
+msgid ""
+"Invalid dates provided. Try dates between 01/02/2004 (Feb. 1st 2004) and "
+"05/05/2020 (May 5th 2020)."
+msgstr ""
+
+#: scisat.py:1534
+msgid ""
+"Missing data. The gas selected has no associated data. Please contact asc"
+".donnees-data.csa@canada.ca."
+msgstr ""
+
+#: scisat.py:1535
+msgid ""
+"Invalid altitude range provided. Altitudes must be between 0 and 150. "
+"Minimum altitude must be strictly lower than maximum altitude. Both "
+"values must be round numbers."
+msgstr ""
+
+#: scisat.py:1536
+msgid "Filter by Latitude (°):"
+msgstr ""
+
+#: scisat.py:1537
+msgid "Minimum latitude"
+msgstr ""
+
+#: scisat.py:1538
+msgid "Maximum latitude"
+msgstr ""
+
+#: scisat.py:1539
+msgid "Filter by Longitude (°):"
+msgstr ""
+
+#: scisat.py:1540
+msgid "Minimum longitude"
+msgstr ""
+
+#: scisat.py:1541
+msgid "Maximum longitude"
+msgstr ""
+
+#: scisat.py:1542
+msgid "Select Altitude Range (km):"
+msgstr ""
+
+#: scisat.py:1543
+msgid "Select Date:"
+msgstr ""
+
+#: scisat.py:1544
+msgid "Select Gas:"
+msgstr ""
+
+#: scisat.py:1545
+msgid "Download Summary Data as CSV"
+msgstr ""
+
+#: scisat.py:1546
+msgid ""
+"Pressing the above button will download the data filtered based on the "
+"longitude, latitude, dates and altitude selected."
+msgstr ""
+
+#: scisat.py:1556
+msgid "Dichlorodifluoromethane"
+msgstr ""
+
+#: scisat.py:1585
+msgid "Carbonyl chlorofluoride"
+msgstr ""
+
diff --git a/scisat.py b/scisat.py
index 663d208..8407c8d 100644
--- a/scisat.py
+++ b/scisat.py
@@ -471,9 +471,7 @@ def build_filtering():
 
         html.Div(
             [
-                html.H3(
-                   id="select-data"
-                ),
+
             ],
             style={"margin-top": "10px", "margin-left": "auto", "margin-right": "auto", "text-align": "center"},
             className="twelve columns"
@@ -484,159 +482,24 @@ def build_filtering():
                 html.Div(
                     [
                     dbc.Alert(color="secondary", id="gas_alert", is_open=False, fade=False),
-                    html.P(
-                        id="gas-text",
-                        className="control_label",
-                    ),
-                    html.Div([
-                    html.Label(
-                        dcc.Dropdown(
-                            id="gaz_list",
-                            options= gaz_name_options,
-                            multi=False,
-                            value='ACEFTS_L2_v4p1_O3.nc',
-                            className="dcc_control",
-                        )
-                    ),
-
-                      html.Span(children=html.P(id="gas_selection"),className="wb-inv")])], style={"textAlign":"left"}
+                    ], style={"textAlign":"left"}
                 ),
                 html.Div(
                     dbc.Alert(color="secondary", id="pos_alert", is_open=False, fade=False, style={"margin-top":"0.5em"}), style={"textAlign":"left"}),
-                html.Div([
-                html.Div( #Latitude picker
-                    [
-                        html.P(
-                            id="latitude-text",
-                            className="control_label",
-                            style={"textAlign":"left"}
-                        ),
-                        html.Div([
-                            html.Label(
-                                id = "lat_min-text",
-                                htmlFor = "lat_min",
-                                hidden = True
-                            ),
-                            dcc.Input(
-                                id="lat_min",
-                                type='number',
-                                value=-90.0,
-                                placeholder="Min Latitude",
-                                min=-90.0,
-                                max=90.0,
-                                step=5,
-                                debounce=True
-                            ),
-                            html.Label(
-                                id = "lat_max-text",
-                                htmlFor = "lat_max",
-                                hidden = True
-                            ),
-                            dcc.Input(
-                                id="lat_max",
-                                type='number',
-                                value=90.0,
-                                placeholder="Max Latitude",
-                                min=-90.0,
-                                max=90.0,
-                                step=5,
-                                debounce=True
-                            )
-                        ]),
-                      html.Span(children=html.P(id="lat_selection"),className="wb-inv")], className="one-third column",
+                html.Div(
+                    dbc.Alert(color="secondary", id="alt_alert", is_open=False, fade=False, style={"margin-top":"0.5em"}), style={"textAlign":"left"}
                 ),
-                html.Div( #longitude picker
-                    [
-                        html.P(
-                            id="longitude-text",
-                            className="control_label",
-                            style ={"textAlign":"center"}
-                        ),
-                        html.Div([
-                            html.Label(
-                                htmlFor="lon_min",
-                                id= "lon_min-text",
-                                hidden = True
-                            ),
-                            dcc.Input(
-                                id="lon_min",
-                                type='number',
-                                value=-180.0,
-                                placeholder="Min Longitude",
-                                min=-180.0,
-                                max=180.0,
-                                step=5,
-                                debounce=True
-                            ),
-                            html.Label(
-                                htmlFor="lon_max",
-                                id= "lon_max-text",
-                                hidden = True
-                            ),
-                            dcc.Input(
-                                id="lon_max",
-                                type='number',
-                                value=180.0,
-                                placeholder="Max Longitude",
-                                min=-180.0,
-                                max=180.0,
-                                step=5,
-                                debounce=True
-                            ),
-                        ]),
-                     html.Span(children=html.P(id="lon_selection"),className="wb-inv") ], className="one-third column", style={"textAlign":"center"}
-                    ),
+                html.Div([
                 html.Div(
                 [ #Year selection + download button
                                 html.Div([
                                     dbc.Alert(color="secondary", id="date_alert", is_open=False, fade=False, style={"margin-top":"0.5em"}),
-                                ]),
-                                html.P(
-                                    id="yearslider-text",
-                                    className="control_label",
-                                    style={"textAlign":"center"}
-                                    ),
-
-                                html.Div([
-                                    html.Label(
-                                        dcc.DatePickerRange(
-                                            id='date_picker_range',
-                                            start_date=dt.datetime(2004, 2, 1),
-                                            end_date=dt.datetime(2020, 5, 5),
-                                            min_date_allowed=dt.datetime(2004, 2, 1),
-                                            max_date_allowed=dt.date.today(),
-                                            start_date_placeholder_text='Select start date',
-                                            end_date_placeholder_text='Select end date',
-                                            display_format="DD/MM/Y"
-                                            ),
-                                        ),
-                                    html.Div(id='output-container-date-picker-range')
-                                    , html.Span(children=html.P(id="date_selection"),className="wb-inv")]
-                                    ),
+                                ])
                             ], className="one-third column", style={"margin-right":"4em", "textAlign":"right"}
                 )
                 ], style={"textAlign":"left"}),
                 html.Hr(),
-                html.Div([ #Choix altitude
-                        html.P(id="altitude-text"),
-                        dcc.RangeSlider(
-                            id='alt_range',
-                            marks = {i: "{}".format(i) for i in np.append(np.arange(0.5,149.5,10),149.5)},
-                            min=0,
-                            max=150,
-                            step=1,
-                            value=[0, 150] ,
-                           # tooltip = { 'always_visible': True }
-                           ),
-                        html.Div(id='output-container-alt-picker-range'),
-                        ],style={"margin-top":"75px"}),
-                html.Div([html.Div([
-                        html.A(
-                            html.Button(id='generate-button', n_clicks=0, className="dash_button", style={'padding-left': '112px', 'padding-right':'112px'}),
-                            id='generate',
-                            target="_blank",
-                            ),
-                        html.Span(children=html.P(id="generate_selection"),className="wb-inv")], className="one-half column", style={"textAlign":"right"}),html.Div([ #Download button
+                html.Div([html.Div([ #Download button
                              html.Div([
                                  html.A(
                                      html.Button(id='download-button-1', n_clicks=0, className="dash_button", style={'padding': '0px 10px'}),
@@ -645,15 +508,15 @@ def build_filtering():
                                      href="",
                                      target="_blank",
                                      ),
-                                 html.Span(children=html.P(id="download_selection"),className="wb-inv")]
-
-                                 ),
+                                 html.Span(children=html.P(id="download_selection"),className="wb-inv"),
+                                 html.P(id="download-description",style={"margin-top":"20px"})
+                                 ]),
                              ],id="cross-filter-options", className="one-half column")], style={"margin-top":"30px"})
             ],
             className="pretty_container twelve column",
             style={"justify-content": "space-evenly"}
             )
-    ])
+    ], style={"padding-left":"10rem"})
 
 
 # Builds the layout for the map displaying the time series
@@ -705,8 +568,192 @@ def build_stats():
             ]),
 
         html.Div(id='none', children=[], style={'display': 'none'}), # Placeholder element to trigger translations upon page load
-        ])
+        ], style = {"padding-left": "10rem"})
 
+def build_sidebar():
+    return html.Div([
+        html.H3(
+           id="select-data",
+           style={"padding-left":"10px"}
+        ),
+        html.Hr(),
+        html.Div([
+        html.P(
+            id="gas-text",
+            className="control_label",
+        ),
+        html.Div([
+        html.Label(
+            dcc.Dropdown(
+                id="gaz_list",
+                options= gaz_name_options,
+                multi=False,
+                value='ACEFTS_L2_v4p1_O3.nc',
+                style={"width":"28rem"}
+            )
+        ),
+
+          html.Span(children=html.P(id="gas_selection"),className="wb-inv")])
+        ]),
+        html.Div( #Latitude picker
+            [
+                html.P(
+                    id="latitude-text",
+                    className="control_label"
+                ),
+                html.Div([
+                    html.Label(
+                        id = "lat_min-text",
+                        htmlFor = "lat_min",
+                        hidden = True
+                    ),
+                    dcc.Input(
+                        id="lat_min",
+                        type='number',
+                        value=-90.0,
+                        placeholder="Min Latitude",
+                        min=-90.0,
+                        max=90.0,
+                        step=5,
+                        debounce=True,
+                        style={"width":"95px"}
+                    ),
+                    html.Label(
+                        id = "lat_max-text",
+                        htmlFor = "lat_max",
+                        hidden = True
+                    ),
+                    dcc.Input(
+                        id="lat_max",
+                        type='number',
+                        value=90.0,
+                        placeholder="Max Latitude",
+                        min=-90.0,
+                        max=90.0,
+                        step=5,
+                        debounce=True,
+                        style={"width":"95px"}
+                    )
+                ]),
+              html.Span(children=html.P(id="lat_selection"),className="wb-inv")],
+        ),
+        html.Div( #longitude picker
+            [
+                html.P(
+                    id="longitude-text",
+                    className="control_label",
+                ),
+                html.Div([
+                    html.Label(
+                        htmlFor="lon_min",
+                        id= "lon_min-text",
+                        hidden = True
+                    ),
+                    dcc.Input(
+                        id="lon_min",
+                        type='number',
+                        value=-180.0,
+                        placeholder="Min Longitude",
+                        min=-180.0,
+                        max=180.0,
+                        step=5,
+                        debounce=True,
+                        style={"width":"95px"}
+                    ),
+                    html.Label(
+                        htmlFor="lon_max",
+                        id= "lon_max-text",
+                        hidden = True
+                    ),
+                    dcc.Input(
+                        id="lon_max",
+                        type='number',
+                        value=180.0,
+                        placeholder="Max Longitude",
+                        min=-180.0,
+                        max=180.0,
+                        step=5,
+                        debounce=True,
+                        style={"width":"95px"}
+                    ),
+                ]),
+             html.Span(children=html.P(id="lon_selection"),className="wb-inv") ],
+            ),
+            html.Div([ #Choix altitude
+                    html.P(id="altitude-text", className="control_label"),
+                    html.Label(
+                        htmlFor="alt_min",
+                        id= "alt_min-text",
+                        hidden = True
+                    ),
+                    dcc.Input(
+                        id="alt_min",
+                        type='number',
+                        value=0,
+                        placeholder="Min Altitude",
+                        min=0,
+                        max=150,
+                        step=1,
+                        debounce=True,
+                        style={"width":"95px"}
+                    ),
+                    html.Label(
+                        htmlFor="alt_max",
+                        id= "alt_max-text",
+                        hidden = True
+                    ),
+                    dcc.Input(
+                        id="alt_max",
+                        type='number',
+                        value=150,
+                        placeholder="Max Longitude",
+                        min=0,
+                        max=150,
+                        step=1,
+                        debounce=True,
+                        style={"width":"95px"}
+                    ),
+                    ]),
+            html.Div([
+            html.P(
+                id="yearslider-text",
+                className="control_label",
+                ),
+
+            html.Div([
+                html.Label(
+                    dcc.DatePickerRange(
+                        id='date_picker_range',
+                        start_date=dt.datetime(2004, 2, 1),
+                        end_date=dt.datetime(2020, 5, 5),
+                        min_date_allowed=dt.datetime(2004, 2, 1),
+                        max_date_allowed=dt.date.today(),
+                        start_date_placeholder_text='Select start date',
+                        end_date_placeholder_text='Select end date',
+                        display_format="DD/MM/Y"
+                        ),
+                    ),
+                html.Div(id='output-container-date-picker-range'),
+                html.Span(children=html.P(id="date_selection"),className="wb-inv")]),
+                html.Hr(),
+                html.Div([
+                        html.A(
+                            html.Button(id='generate-button', n_clicks=0, className="dash_button", style={'padding-left': '75px', 'padding-right':'75px'}),
+                            id='generate',
+                            target="_blank",
+                            ),
+                        html.Span(children=html.P(id="generate_selection"),className="wb-inv")], style={"textAlign":"center"})
+            ])
+
+    ], style = {
+        "position": "fixed",
+        "top": 0,
+        "left": 0,
+        "bottom": 0,
+        "width": "32rem",
+        "padding": "2rem 1rem",
+        "background-color": "#f8f9fa"
+    })
 # Create app layout
 app.layout = html.Div(
     [
@@ -719,6 +766,7 @@ def build_stats():
                 build_header(),
                 build_filtering(),
                 build_stats(),
+                build_sidebar(),
             ],
             id="mainContainer",
             style={"display": "flex", "flex-direction": "column", "margin": "auto", "width":"75%"},
@@ -792,13 +840,17 @@ def update_gas(gaz_list, is_open):
 
 # Update altitude range. The output is used as a placeholder because Dash does not allow to have no output on callbacks.
 @app.callback(
-    Output("placeholder","value"),
-    [Input("alt_range", "value")]
+    Output("alt_alert","is_open"),
+    [Input("alt_min", "value"), Input("alt_max", "value")]
 )
-def update_alt(alt_range):
+def update_alt(alt_min, alt_max):
     global ALT_RANGE
-    ALT_RANGE = alt_range
-    return ""
+    s = False
+    if alt_validation(alt_min, alt_max):
+        ALT_RANGE = [alt_min, alt_max]
+    else:
+        s = True
+    return s
 
 # Lat/long validation
 def pos_validation(lat_min,lat_max,lon_min,lon_max):
@@ -829,6 +881,13 @@ def gas_validation(gaz_list):
         return False
     return True
 
+def alt_validation(alt_min, alt_max):
+    try:
+        s = ((alt_min < alt_max) and (alt_min>=0) and (alt_min<=150) and (alt_max>=0) and (alt_max<=150))
+    except TypeError:
+        s = False
+    return s
+
 #=======================================================================================================================
 # This section is for graph generation. The 3 graphs are generated here.
 
@@ -895,6 +954,7 @@ def make_count_figure(df):
     ]
 
     layout = dict(
+        title = _("Mean concentration distribution on altitude"),
         autosize=True,
         automargin=True,
         plot_bgcolor="#F9F9F9",
@@ -1043,7 +1103,9 @@ def generate_geo_map(df):
         )
     # We set the layout for margins and paddings
     fig.update_layout(
-        margin=dict(l=10, r=10, t=20, b=10, pad=5),
+        title=_("World graph of mean gas concentration"),
+        title_x=0.5,
+        margin=dict(l=10, r=10, t=40, b=10, pad=5),
         clickmode="event+select",
         hovermode="closest",
         mapbox=go.layout.Mapbox(
@@ -1429,6 +1491,7 @@ def download_csv():
         Output("pos_alert", "children"),
         Output("date_alert", "children"),
         Output("gas_alert", "children"),
+        Output("alt_alert", "children"),
         Output("latitude-text", "children"),
         Output("lat_min-text", "children"),
         Output("lat_max-text", "children"),
@@ -1439,6 +1502,7 @@ def download_csv():
         Output("yearslider-text", "children"),
         Output("gas-text", "children"),
         Output("download-button-1", "children"),
+        Output("download-description", "children"),
         Output("gaz_list", "options"),
     ],
         [Input('none', 'children')], # A placeholder to call the translations upon startup
@@ -1468,16 +1532,18 @@ def translate_static(x):
                 _("Invalid values provided. Latitude values must be between -90 and 90. Longitude values must be between -180 and 180. Minimum values must be smaller than maximum values. All values must be round numbers that are multiples of 5."),
                 _("Invalid dates provided. Try dates between 01/02/2004 (Feb. 1st 2004) and 05/05/2020 (May 5th 2020)."),
                 _("Missing data. The gas selected has no associated data. Please contact asc.donnees-data.csa@canada.ca."),
-                _("Filter by Latitude:"),
+                _("Invalid altitude range provided. Altitudes must be between 0 and 150. Minimum altitude must be strictly lower than maximum altitude. Both values must be round numbers."),
+                _("Filter by Latitude (°):"),
                 _("Minimum latitude"),
                 _("Maximum latitude"),
-                _("Filter by Longitude:"),
+                _("Filter by Longitude (°):"),
                 _("Minimum longitude"),
                 _("Maximum longitude"),
-                _("Select Altitude Range:"),
+                _("Select Altitude Range (km):"),
                 _("Select Date:"),
                 _("Select Gas:"),
                 _('Download Summary Data as CSV'),
+                _("Pressing the above button will download the data filtered based on the longitude, latitude, dates and altitude selected."),
                 #_('Download full data as netcdf'),
                 # _("Select x-axis:"),
                 # _("Select y-axis:"),
diff --git a/translations/fr/LC_MESSAGES/messages.mo b/translations/fr/LC_MESSAGES/messages.mo
index 1f1e8f5..7ef472c 100644
Binary files a/translations/fr/LC_MESSAGES/messages.mo and b/translations/fr/LC_MESSAGES/messages.mo differ
diff --git a/translations/fr/LC_MESSAGES/messages.po b/translations/fr/LC_MESSAGES/messages.po
index 4ad276e..644f000 100644
--- a/translations/fr/LC_MESSAGES/messages.po
+++ b/translations/fr/LC_MESSAGES/messages.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2021-03-16 08:03-0700\n"
+"POT-Creation-Date: 2021-03-25 16:51-0400\n"
 "PO-Revision-Date: 2020-07-10 16:35-0400\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language: fr\n"
@@ -16,105 +16,105 @@ msgstr ""
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=utf-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"Generated-By: Babel 2.8.0\n"
+"Generated-By: Babel 2.8.1\n"
 
-#: scisat.py:263 scisat.py:1494
+#: scisat.py:263 scisat.py:1553
 msgid "Acetone"
 msgstr "Acétone"
 
-#: scisat.py:264 scisat.py:1495
+#: scisat.py:264 scisat.py:1554
 msgid "Acetylene"
 msgstr "Acétylène"
 
-#: scisat.py:265 scisat.py:1496
+#: scisat.py:265 scisat.py:1555
 msgid "Ethane"
 msgstr "Éthane"
 
-#: scisat.py:266 scisat.py:1498
+#: scisat.py:266 scisat.py:1557
 msgid "Trichlorofluoromethane"
 msgstr "Trichlorofluorométhane"
 
-#: scisat.py:267 scisat.py:1499
+#: scisat.py:267 scisat.py:1558
 msgid "Carbon tetrachloride"
 msgstr "Tétrachlorure de carbone"
 
-#: scisat.py:269 scisat.py:1502
+#: scisat.py:269 scisat.py:1561
 msgid "Carbon tetrafluoride"
 msgstr "Tétrafluorure de carbone"
 
-#: scisat.py:270 scisat.py:1503
+#: scisat.py:270 scisat.py:1562
 msgid "Trichlorotrifluoroethane"
 msgstr "Trichlorotrifluoroéthane"
 
-#: scisat.py:271 scisat.py:1504
+#: scisat.py:271 scisat.py:1563
 msgid "Chloromethane"
 msgstr "Chlorométhane"
 
-#: scisat.py:272 scisat.py:1505
+#: scisat.py:272 scisat.py:1564
 msgid "Acetonitrite"
 msgstr "Acétonitrile"
 
-#: scisat.py:273 scisat.py:1506
+#: scisat.py:273 scisat.py:1565
 msgid "Methanol"
 msgstr "Méthanol"
 
-#: scisat.py:274 scisat.py:1507
+#: scisat.py:274 scisat.py:1566
 msgid "Methane"
 msgstr "Méthane"
 
-#: scisat.py:276 scisat.py:1509
+#: scisat.py:276 scisat.py:1568
 msgid "Methane 212"
 msgstr "Méthane 212"
 
-#: scisat.py:277 scisat.py:1510
+#: scisat.py:277 scisat.py:1569
 msgid "Methane 311"
 msgstr "Méthane 311"
 
-#: scisat.py:278 scisat.py:1511
+#: scisat.py:278 scisat.py:1570
 msgid "Difluorochloromethane"
 msgstr "Difluorochlorométhane"
 
-#: scisat.py:279 scisat.py:1512
+#: scisat.py:279 scisat.py:1571
 msgid "Trifluoromethane"
 msgstr "Trifluorométhane"
 
-#: scisat.py:280 scisat.py:1513
+#: scisat.py:280 scisat.py:1572
 msgid "Chlorine monoxide"
 msgstr "Monoxyde de chlore"
 
-#: scisat.py:281 scisat.py:1514
+#: scisat.py:281 scisat.py:1573
 msgid "Chlorine nitrate"
 msgstr "Nitrate de chlore"
 
-#: scisat.py:283 scisat.py:1516
+#: scisat.py:283 scisat.py:1575
 msgid "Carbon monoxide"
 msgstr "Monoxyde de carbone"
 
-#: scisat.py:284 scisat.py:1517
+#: scisat.py:284 scisat.py:1576
 msgid "Carbon dioxide"
 msgstr "Dioxyde de carbone"
 
-#: scisat.py:285 scisat.py:1518
+#: scisat.py:285 scisat.py:1577
 msgid "Carbon dioxide 627"
 msgstr "Dioxyde de carbone 627"
 
-#: scisat.py:286 scisat.py:1519
+#: scisat.py:286 scisat.py:1578
 msgid "Carbon dioxide 628"
 msgstr "Dioxyde de carbone 628"
 
-#: scisat.py:287 scisat.py:1520
+#: scisat.py:287 scisat.py:1579
 msgid "Carbon dioxide 636"
 msgstr "Dioxyde de carbone 636"
 
-#: scisat.py:288 scisat.py:1521
+#: scisat.py:288 scisat.py:1580
 msgid "Carbon dioxide 637"
 msgstr "Dioxyde de carbone 637"
 
-#: scisat.py:291 scisat.py:1524
+#: scisat.py:291 scisat.py:1583
 msgid "Carbon dioxide 638"
 msgstr "Dioxyde de carbone 638"
 
-#: scisat.py:292 scisat.py:1525
+#: scisat.py:292 scisat.py:1584
 msgid "Phosgene"
 msgstr "Phosgène"
 
@@ -122,231 +122,239 @@ msgstr "Phosgène"
 msgid "Carbonyl chlorine fluoride"
 msgstr ""
 
-#: scisat.py:294 scisat.py:1527
+#: scisat.py:294 scisat.py:1586
 msgid "Carbonyl fluoride"
 msgstr "Fluorure de carbonyle"
 
-#: scisat.py:295 scisat.py:1528
+#: scisat.py:295 scisat.py:1587
 msgid "Carbon monoxide 27"
 msgstr "Monoxyde de carbone 27"
 
-#: scisat.py:296 scisat.py:1529
+#: scisat.py:296 scisat.py:1588
 msgid "Carbon monoxide 28"
 msgstr "Monoxyde de carbone 28"
 
-#: scisat.py:298 scisat.py:1531
+#: scisat.py:298 scisat.py:1590
 msgid "Carbon monoxide 36"
 msgstr "Monoxyde de carbone 36"
 
-#: scisat.py:299 scisat.py:1532
+#: scisat.py:299 scisat.py:1591
 msgid "Carbon monoxide 38"
 msgstr "Monoxyde de carbone 38"
 
-#: scisat.py:300 scisat.py:1533
+#: scisat.py:300 scisat.py:1592
 msgid "GLC"
 msgstr "Géolocatisation"
 
-#: scisat.py:301 scisat.py:1534
+#: scisat.py:301 scisat.py:1593
 msgid "Formaldehyde"
 msgstr "Formaldéhyde"
 
-#: scisat.py:302 scisat.py:1535
+#: scisat.py:302 scisat.py:1594
 msgid "Water"
 msgstr "Eau"
 
-#: scisat.py:303 scisat.py:1536
+#: scisat.py:303 scisat.py:1595
 msgid "Hydrogen peroxide"
 msgstr "Peroxyde d'hydrogène"
 
-#: scisat.py:306 scisat.py:1539
+#: scisat.py:306 scisat.py:1598
 msgid "Water 162"
 msgstr "Eau 162"
 
-#: scisat.py:307 scisat.py:1540
+#: scisat.py:307 scisat.py:1599
 msgid "Water 171"
 msgstr "Eau 171"
 
-#: scisat.py:308 scisat.py:1541
+#: scisat.py:308 scisat.py:1600
 msgid "Water 181"
 msgstr "Eau 181"
 
-#: scisat.py:309 scisat.py:1542
+#: scisat.py:309 scisat.py:1601
 msgid "Water 182"
 msgstr "Eau 182"
 
-#: scisat.py:310 scisat.py:1543
+#: scisat.py:310 scisat.py:1602
 msgid "Hydrochlorofluorocarbon 141b"
 msgstr "Hydrochlorofluorocarbone 141b"
 
-#: scisat.py:311 scisat.py:1544
+#: scisat.py:311 scisat.py:1603
 msgid "Hydrochlorofluorocarbon 142b"
 msgstr "Hydrochlorofluorocarbone 142b"
 
-#: scisat.py:312 scisat.py:1545
+#: scisat.py:312 scisat.py:1604
 msgid "Hydrochloric acid"
 msgstr "Acide chlorydrique"
 
-#: scisat.py:316 scisat.py:1547
+#: scisat.py:316 scisat.py:1606
 msgid "Hydrogen cyanide"
 msgstr "Cyanure d'hydrogène"
 
-#: scisat.py:317 scisat.py:1548
+#: scisat.py:317 scisat.py:1607
 msgid "Formic acid"
 msgstr "Acide formique"
 
-#: scisat.py:318 scisat.py:1549
+#: scisat.py:318 scisat.py:1608
 msgid "Hydrogen fluoride"
 msgstr "Fluorure d'hydrogène"
 
-#: scisat.py:319 scisat.py:1550
+#: scisat.py:319 scisat.py:1609
 msgid "Hydrofluorocarbon 134a"
 msgstr "Hydrofluorocarbure 134a"
 
-#: scisat.py:320 scisat.py:1551
+#: scisat.py:320 scisat.py:1610
 msgid "Nitric acid"
 msgstr "Acide nitrique"
 
-#: scisat.py:321 scisat.py:1552
+#: scisat.py:321 scisat.py:1611
 msgid "Nitric acid 156"
 msgstr "Acide nitrique 156"
 
-#: scisat.py:324 scisat.py:1555
+#: scisat.py:324 scisat.py:1614
 msgid "Peroxynitric acid"
 msgstr "Acide perazotique"
 
-#: scisat.py:325 scisat.py:1556
+#: scisat.py:325 scisat.py:1615
 msgid "Nitrogen"
 msgstr "Azote"
 
-#: scisat.py:326 scisat.py:1557
+#: scisat.py:326 scisat.py:1616
 msgid "Nitrous oxide"
 msgstr "Protoxyde d'azote"
 
-#: scisat.py:327 scisat.py:1558
+#: scisat.py:327 scisat.py:1617
 msgid "Dinitrogen pentaoxide"
 msgstr "Pentaoxyde de diazote"
 
-#: scisat.py:328 scisat.py:1559
+#: scisat.py:328 scisat.py:1618
 msgid "Nitrous oxide 447"
 msgstr "Protoxyde d'azote 447"
 
-#: scisat.py:329 scisat.py:1560
+#: scisat.py:329 scisat.py:1619
 msgid "Nitrous oxide 448"
 msgstr "Protoxyde d'azote 448"
 
-#: scisat.py:331 scisat.py:1562
+#: scisat.py:331 scisat.py:1621
 msgid "Nitrous oxide 456"
 msgstr "Protoxyde d'azote 456"
 
-#: scisat.py:332 scisat.py:1563
+#: scisat.py:332 scisat.py:1622
 msgid "Nitrous oxide 546"
 msgstr "Protoxyde d'azote 546"
 
-#: scisat.py:333 scisat.py:1564
+#: scisat.py:333 scisat.py:1623
 msgid "Nitrous monoxide 447"
 msgstr "Monoxide d'azote 447"
 
-#: scisat.py:334 scisat.py:1565
+#: scisat.py:334 scisat.py:1624
 msgid "Nitrogen dioxide"
 msgstr "Dioxyde d'azote"
 
-#: scisat.py:335 scisat.py:1566
+#: scisat.py:335 scisat.py:1625
 msgid "Nitrogen dioxide 656"
 msgstr "Dioxyde d'azote 656"
 
-#: scisat.py:336 scisat.py:1567
+#: scisat.py:336 scisat.py:1626
 msgid "Oxygen"
 msgstr "Oxygène"
 
-#: scisat.py:339 scisat.py:1570
+#: scisat.py:339 scisat.py:1629
 msgid "Ozone"
 msgstr "Ozone"
 
-#: scisat.py:340 scisat.py:1571
+#: scisat.py:340 scisat.py:1630
 msgid "Ozone 667"
 msgstr "Ozone 667"
 
-#: scisat.py:341 scisat.py:1572
+#: scisat.py:341 scisat.py:1631
 msgid "Ozone 668"
 msgstr "Ozone 668"
 
-#: scisat.py:342 scisat.py:1573
+#: scisat.py:342 scisat.py:1632
 msgid "Ozone 676"
 msgstr "Ozone 676"
 
-#: scisat.py:343 scisat.py:1574
+#: scisat.py:343 scisat.py:1633
 msgid "Ozone 686"
 msgstr "Ozone 686"
 
-#: scisat.py:344 scisat.py:1575
+#: scisat.py:344 scisat.py:1634
 msgid "Carbonyl sulfide"
 msgstr "Sulfure de carbonyle"
 
-#: scisat.py:345 scisat.py:1576
+#: scisat.py:345 scisat.py:1635
 msgid "Carbonyl sulfide 623"
 msgstr "Sulfure de carbonyle 623"
 
-#: scisat.py:348 scisat.py:1579
+#: scisat.py:348 scisat.py:1638
 msgid "Carbonyl sulfide 624"
 msgstr "Sulfure de carbonyle 624"
 
-#: scisat.py:349 scisat.py:1580
+#: scisat.py:349 scisat.py:1639
 msgid "Carbonyl sulfide 632"
 msgstr "Sulfure de carbonyle 632"
 
-#: scisat.py:350 scisat.py:1581
+#: scisat.py:350 scisat.py:1640
 msgid "Phosphorus"
 msgstr "Phosphore"
 
-#: scisat.py:351 scisat.py:1582
+#: scisat.py:351 scisat.py:1641
 msgid "Polyacrylonitrile"
 msgstr "Polyacrylonitrile"
 
-#: scisat.py:352 scisat.py:1583
+#: scisat.py:352 scisat.py:1642
 msgid "Sulfur hexafluoride"
 msgstr "Hexafluorure de soufre"
 
-#: scisat.py:353 scisat.py:1584
+#: scisat.py:353 scisat.py:1643
 msgid "Sulfur dioxide"
 msgstr "Dioxyde de soufre"
 
-#: scisat.py:884
+#: scisat.py:946
 msgid "Altitude"
 msgstr "Altitude"
 
-#: scisat.py:902 scisat.py:1161
+#: scisat.py:957
+msgid "Mean concentration distribution on altitude"
+msgstr "Distribution des concentrations moyennes sur l'altitude"
+
+#: scisat.py:965 scisat.py:1216
 msgid "Concentration [ppv]"
 msgstr "Concentration [ppv]"
 
-#: scisat.py:909
+#: scisat.py:972
 msgid "Altitude [km]"
 msgstr "Altitude [km]"
 
-#: scisat.py:1008 scisat.py:1041
+#: scisat.py:1061 scisat.py:1094
 msgid "Gas Concentration [ppv] (mean on altitude and position) "
 msgstr "Concentration du gaz [ppv] (moyenne sur l'altitude et la position)"
 
-#: scisat.py:1156
+#: scisat.py:1106
+msgid "World graph of mean gas concentration"
+msgstr "Concentration moyenne du gas dans le monde"
+
+#: scisat.py:1211
 msgid "Time Series"
 msgstr "Série temporelle"
 
-#: scisat.py:1158
+#: scisat.py:1213
 msgid "Date"
 msgstr "Date"
 
-#: scisat.py:1456
+#: scisat.py:1513
 msgid "SCISAT Data Visualisation"
 msgstr "Visualisation des données de SCISAT"
 
-#: scisat.py:1457
+#: scisat.py:1514
 msgid "Learn More About SCISAT"
 msgstr "En apprendre plus sur SCISAT"
 
-#: scisat.py:1458
+#: scisat.py:1515
 msgid "Data selected"
 msgstr "Données sélectionnées"
 
-#: scisat.py:1459
+#: scisat.py:1516
 msgid ""
 "Launched on August 12, 2003, SCISAT helps a team of Canadian and "
 "international scientists improve their understanding of the depletion of "
@@ -358,7 +366,7 @@ msgstr ""
 "compréhension de l'appauvrissement de la couche d'ozone, en étudiant "
 "spécialement ces changements au-dessus du Canada et de l'arctique."
 
-#: scisat.py:1460
+#: scisat.py:1517
 msgid ""
 "This application provides users the ability to select, download and "
 "visualize SCISAT's data. The dataset can also be accessed in [CSA's Open "
@@ -366,21 +374,23 @@ msgid ""
 "ad40-781cdb43cf24)."
 msgstr ""
 "Cette application permet aux utilisateurs de sélectionner, télécharger et"
-" visualiser les données de SCISAT. Ce jeu de données est également accessible "
-"sur le [portail du gouvernement ouvert de l’ASC](https://data.asc-csa.gc.ca/fr/dataset/02969436-8c0b-4e6e-ad40-781cdb43cf24)."
+" visualiser les données de SCISAT. Ce jeu de données est également "
+"accessible sur le [portail du gouvernement ouvert de l’ASC](https://data"
+".asc-csa.gc.ca/fr/dataset/02969436-8c0b-4e6e-ad40-781cdb43cf24)."
 
-#: scisat.py:1461
+#: scisat.py:1518
 msgid ""
 "The authoritative source data for the Atmospheric Chemistry Experiment "
 "(ACE), also known as SCISAT, is available on the [ACE "
 "site](http://www.ace.uwaterloo.ca/data.php) (external site only available"
 " in English). "
 msgstr ""
-"La source autorisée pour les données de l’Expérience de chimie atmosphérique (ACE), "
-"également connue sous le nom SCISAT,  est disponible sur le [site du projet ACE](http://www.ace.uwaterloo.ca/data.php) "
-"(site externe et seulement disponible en anglais).  "
+"La source autorisée pour les données de l’Expérience de chimie "
+"atmosphérique (ACE), également connue sous le nom SCISAT,  est disponible"
+" sur le [site du projet ACE](http://www.ace.uwaterloo.ca/data.php) (site "
+"externe et seulement disponible en anglais).  "
 
-#: scisat.py:1462
+#: scisat.py:1519
 msgid ""
 "Please read this [Important Mission Information "
 "Document](http://www.ace.uwaterloo.ca/ACE-"
@@ -388,26 +398,29 @@ msgid ""
 "ACE/SCISAT data. Please refer to the relevant scientific literature when "
 "interpreting SCISAT data."
 msgstr ""
-"Veuillez lire ce [document d’informations importantes sur la mission](http://www.ace.uwaterloo.ca/ACE-FTS_v2.2/ACEFTSPublicReleaseDocumentation.pdf) "
-" avant d’utiliser les données ACE/SCISAT. Veuillez vous référer à la littérature scientifique pertinente pour interpréter les données SCISAT. "
+"Veuillez lire ce [document d’informations importantes sur la "
+"mission](http://www.ace.uwaterloo.ca/ACE-"
+"FTS_v2.2/ACEFTSPublicReleaseDocumentation.pdf)  avant d’utiliser les "
+"données ACE/SCISAT. Veuillez vous référer à la littérature scientifique "
+"pertinente pour interpréter les données SCISAT. "
 
-#: scisat.py:1463
+#: scisat.py:1520
 msgid "Visit our Github page to learn more about our applications."
 msgstr "Visitez notre page Github pour en apprendre plus sur nos applications."
 
-#: scisat.py:1464
+#: scisat.py:1521
 msgid "Select Data"
 msgstr "Sélectionner les données"
 
-#: scisat.py:1465
+#: scisat.py:1522
 msgid "Update"
 msgstr "Mettre à jour"
 
-#: scisat.py:1466
+#: scisat.py:1523
 msgid "Update with selected data"
 msgstr "Mettre à jour avec les données séléctionnées"
 
-#: scisat.py:1467
+#: scisat.py:1524
 msgid ""
 "Graph of the gas concentration in parts per volume (ppv) visualized on a "
 "world map. Each dot represents the mean concentration on the selected "
@@ -419,7 +432,7 @@ msgstr ""
 "choisies, la colonne d'altitude ainsi que la position, et la couleur "
 "indique la concentration moyenne."
 
-#: scisat.py:1468
+#: scisat.py:1525
 msgid ""
 "Graph showing the gas concentration in parts per volume (ppv) over the "
 "selected altitude interval. The value represents the mean concentration "
@@ -430,7 +443,7 @@ msgstr ""
 "selon l'intervalle d'altitude sélectionnée. La moyenne est faite sur "
 "toutes les positions ainsi que toutes les dates sélectionnées."
 
-#: scisat.py:1469
+#: scisat.py:1526
 msgid ""
 "Time series showing the evolution of the gas concentration in parts per "
 "volume (ppv). Each data point represents the daily overall mean "
@@ -440,27 +453,27 @@ msgstr ""
 "(ppv) sur les dates sélectionnées. Chaque point est une moyenne "
 "quotidienne sur l'altitude ainsi que la position."
 
-#: scisat.py:1470
+#: scisat.py:1527
 msgid "Selection of the gas"
 msgstr "Sélection du gaz"
 
-#: scisat.py:1471
+#: scisat.py:1528
 msgid "Selection of the range of latitude "
 msgstr "Sélection de la plage de latitude"
 
-#: scisat.py:1472
+#: scisat.py:1529
 msgid "Selection of the range of longitude"
 msgstr "Sélection de la plage de longitude"
 
-#: scisat.py:1473
+#: scisat.py:1530
 msgid "Date selection"
 msgstr "Sélection de la plage de date"
 
-#: scisat.py:1474
+#: scisat.py:1531
 msgid "Download the selected dataset"
 msgstr "Télécharger le jeu de données sélectionné"
 
-#: scisat.py:1475
+#: scisat.py:1532
 msgid ""
 "Invalid values provided. Latitude values must be between -90 and 90. "
 "Longitude values must be between -180 and 180. Minimum values must be "
@@ -472,7 +485,7 @@ msgstr ""
 "valeurs minimum doivent être plus petites que les valeurs maximum. Toutes"
 " valeurs doivent être des chiffres entiers multiples de 5."
 
-#: scisat.py:1476
+#: scisat.py:1533
 msgid ""
 "Invalid dates provided. Try dates between 01/02/2004 (Feb. 1st 2004) and "
 "05/05/2020 (May 5th 2020)."
@@ -480,7 +493,7 @@ msgstr ""
 "Dates reçues invalides. Essayez de sélectionner des dates entre "
 "01/02/2004 (1er fév. 2004) et 05/05/2020 (5 mai 2020)."
 
-#: scisat.py:1477
+#: scisat.py:1534
 msgid ""
 "Missing data. The gas selected has no associated data. Please contact asc"
 ".donnees-data.csa@canada.ca."
@@ -488,51 +501,69 @@ msgstr ""
 "Données manquantes. Le gaz séléctionné ne possède pas de données "
 "associées. Veuillez contacter asc.donnees-data.csa@canada.ca."
 
-#: scisat.py:1478
-msgid "Filter by Latitude:"
-msgstr "Sélectionner par latitude"
+#: scisat.py:1535
+msgid ""
+"Invalid altitude range provided. Altitudes must be between 0 and 150. "
+"Minimum altitude must be strictly lower than maximum altitude. Both "
+"values must be round numbers."
+msgstr ""
+"Plage d'altitude reçue invalide. Les altitudes doivent être entre 0 et "
+"150. L'altitude minimum doit être strictement plus petite que l'altitude "
+"maximum. Les deux valeurs doivent être des chiffres entiers."
+
+#: scisat.py:1536
+msgid "Filter by Latitude (°):"
+msgstr "Filtrer par Latitude (°):"
 
-#: scisat.py:1479
+#: scisat.py:1537
 msgid "Minimum latitude"
 msgstr "Latitude minimum"
 
-#: scisat.py:1480
+#: scisat.py:1538
 msgid "Maximum latitude"
 msgstr "Latitude maximum"
 
-#: scisat.py:1481
-msgid "Filter by Longitude:"
-msgstr "Sélectionner par longitude"
+#: scisat.py:1539
+msgid "Filter by Longitude (°):"
+msgstr "Filtrer par Longitude (°):"
 
-#: scisat.py:1482
+#: scisat.py:1540
 msgid "Minimum longitude"
 msgstr "Longitude minimum"
 
-#: scisat.py:1483
+#: scisat.py:1541
 msgid "Maximum longitude"
 msgstr "Longitude maximum"
 
-#: scisat.py:1484
-msgid "Select Altitude Range:"
-msgstr "Sélectionner l'intervalle d'altitudes"
+#: scisat.py:1542
+msgid "Select Altitude Range (km):"
+msgstr "Sélectionner la plage d'altitude (km):"
 
-#: scisat.py:1485
+#: scisat.py:1543
 msgid "Select Date:"
 msgstr "Sélectionner les dates :"
 
-#: scisat.py:1486
+#: scisat.py:1544
 msgid "Select Gas:"
 msgstr "Sélectionner le gaz :"
 
-#: scisat.py:1487
+#: scisat.py:1545
 msgid "Download Summary Data as CSV"
 msgstr "Télécharger les données en format CSV"
 
-#: scisat.py:1497
+#: scisat.py:1546
+msgid ""
+"Pressing the above button will download the data filtered based on the "
+"longitude, latitude, dates and altitude selected."
+msgstr ""
+"Appuyer sur le bouton ci-haut télécharge les données filtrées en fonction"
+" des longitudes, latitudes, dates et altitudes séléctionnées."
+
+#: scisat.py:1556
 msgid "Dichlorodifluoromethane"
 msgstr "Dichlorodifluorométhane"
 
-#: scisat.py:1526
+#: scisat.py:1585
 msgid "Carbonyl chlorofluoride"
 msgstr "Chlorofluorure de carbonyle"
 
@@ -583,13 +614,13 @@ msgstr "Chlorofluorure de carbonyle"
 #~ msgstr "Selection des données"
 
 #~ msgid "Filter by Latitude:"
-#~ msgstr "Sélectionner par Latitude :"
+#~ msgstr "Sélectionner par latitude"
 
 #~ msgid "Filter by Longitude:"
-#~ msgstr "Sélectionner par Longitude :"
+#~ msgstr "Sélectionner par longitude"
 
 #~ msgid "Select Altitude Range:"
-#~ msgstr "Sélection de la plage d'altitude :"
+#~ msgstr "Sélectionner l'intervalle d'altitudes"
 
 #~ msgid "Select Date:"
 #~ msgstr "Sélection des dates :"