Recovered masses and mass ratios of stars in a simulated solar metallicity cluster (d = 1 kpc, A_V ~ 0.1 mag, and log(Age) = 9.5 dex). The modes of the unweighted (top) and weighted (bottom), using cluster parameter information, M_A and q posteriors are shown with respect to the simulated parameters. The colour of each data point represents the (fractional) uncertainty in the corresponding (M_A) q, and the black data points correspond to stars that are not on the MS or have G ≥ 19 mag. The dashed line in the bottom right panel indicates the q_thresh (see text for details) above which we can reliably predict the mass ratio of an unresolved binary in this cluster.