Return missing txt files

examples/data/fad_kinetics/fad_emission_spectrum.TXT

@@ -0,0 +1,27 @@
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examples/data/fad_kinetics/fad_emission_spectrum_wavelength.TXT

@@ -0,0 +1,27 @@
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examples/data/fad_kinetics/fad_groundstate_spectrum_wavelength.TXT

@@ -0,0 +1,58 @@
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