Mass ratio distribution corresponding to the M07 sample as derived with the Richardson-Lucy algorithm, when using the primary mass derived from the fit of the isochrones (top panel) or assuming a Gaussian distribution (lower panel). For the latter, we have run 1000 simulations and indicate the 1σ error bars associated with these. In the top panel, we also show, with the red dashed line connecting heavy dots, the distribution we obtain with our inversion method when giving as input a uniform distribution (see text), while in the lower panel the dashed cyan line connecting dots just shows a uniform distribution of mass ratios for comparison.