Improve README.md

README.md

@@ -11,12 +11,13 @@ This repository contains programs, libraries and interfaces to read and write
 [high-energy collisions] independently from their [PDFs] and the [strong
 coupling].
 
-PineAPPL grids are generated by Monte Carlo generators, and the grids can be
-used to generate predictions, such as the following one:
+PineAPPL grids are generated by Monte Carlo generators, and the grids in turn
+can be convoluted with PDFs to produce tables and plots, such as the following
+one:
 
 ![plot](docs/NNPDF_DY_14TEV_40_PHENO.jpeg)
 
-which is from [arXiv:2401.08749], figure 4.4.
+(image from [arXiv:2401.08749], on p. 16, figure 4.4)
 
 [high-energy collisions]: https://en.wikipedia.org/wiki/Particle_physics
 [PDFs]: https://en.wikipedia.org/wiki/Parton_(particle_physics)#Parton_distribution_functions