CMDs, two-colour diagrams, and spatial distribution from Subaru Suprime-Cam photometry (V < 24). Panels a–c: diagrams with objects within the ellipse (innermost ellipse centred on Leo A shown in panel d is limited by the extent of the HST ACS field outlined with blue lines). Interactively removed objects (based on visual HST ACS image analysis) are shown as black dots. Panel d: object distribution in the initial catalogue. Parameters of the depicted ellipses are as follows: semi-major axis, a (indicated in the top left corner); ellipticity, b/a = 0.6; position angle of the major axis, PA = 114°. Panels e–h: diagrams with objects excluded from further analysis by applying restrictions of sharpness and χ² (see Sect. 2 and Figs. A.2 and A.3) shown as black dots. Panels i–l: diagrams with MW dwarfs of K-M spectral types shown as black dots. The isochrones (Bressan et al. 2012) for main-sequence stars of masses 0.09−0.80 M_⊙ and of Z = 0.015, 0.004, 0.001 metallicity (green, magenta, and blue, respectively) are depicted in panel k.