Gaia BPRP CMDs for the SigMA clusters 1–20. Only cluster members, which pass the photometric quality criteria from Eq. (2) are plotted, with the remaining number of sources given in the legend (Phot-cut). The dots are color-coded for stability with lower limits set to 2.5% (orange) and upper limits (dark) are varied per cluster, as given in the legend (Stab-limit, %). The magenta and blue solid lines show the best-fitting PARSEC (P) and BHAC15 (B) isochrones, respectively, as determined for BPRP, and the dashed lines show the upper and lower age limits (age limits are given in parenthesis in the legend). The horizontal solid and dashed light-gray lines give the magnitude limits at M_G > 10 mag and M_G > 12 mag for PARSEC and BHAC15, respectively, used to exclude sources from the age fitting.