Mass-to-light ratio. The measured r-band mass-to-light ratio for a 10 Gyr and solar metallicity population is shown as a function of the number of stars in the semi-resolved FASTAR models. Shaded areas correspond to the 10/90 and 1/99 percentiles of the distribution of retrieved values after the stochastic sampling of the IMF. The solid red line indicates the median value for each N_stars bin.