Color-based mass-to-light ratio estimates. The (logarithmic) ratio between the intrinsic mass-to-light ratio and that estimated using the color relations of Roediger & Courteau (2015), computed as a function of N_stars for a 10 Gyr and solar metallicity FASTAR semi-resolved population. As in the figures above, shaded areas correspond to the 10/90 and 1/99 percentiles of the measured distribution while the solid purple line corresponds to the median.