Same as Fig. 7, but for the OCs NGC 4337, NGC 3680, M 67, and NGC 1582. For NGC 4337 and NGC 752 (Fig. 5), slightly larger than solar metallicity isochrones were employed (see Table 1). In the M 67 CMD, the black open rectangles represent non-member stars without astrometric data in the Gaia DR2 catalogue, but presenting photometric membership likelihood L_phot ≥ 0.5; black filled rectangles are possible member stars without available astrometric information (and with L_phot ≥ 0.5).