Panel a)r_Sloan vs. B_Bessel − r_Sloan CMD-cleaned, according to the photometric selection criteria described in the text. Mean errors are also shown on the right for each magnitude bin. Panel b) Displacement based on the r_Sloan -filter as a function of magnitude. Mean errors are also shown. Red symbols mark proper-motion (PM) selected stars (see text). Panels c) Vector-point diagrams for each magnitude bin. Symbols are the same as in panel b). Panel d): r_Sloan vs. B_Bessel − r_Sloan PM-selected CMD.