Example of a 6D completeness mask. This figure represents the ratio of the number of 6D stars and 5D stars (N_6D/N_5D as a function of apparent colour and magnitude for healpixel number 8 (P_6D P6Dmask#8). Yellow colours denote regions where all 5D stars have a radial velocity measurement, whereas dark blue is linked to an absence of radial velocity measurements. We show how, in areas in the CMD not covered by stars from this region, we use the P_6D all sky. This is shown in this plot as background, where blue colours denote zero probability and red means 100% probability.