Distribution of stars (red and blue dots) with I-band magnitudes in the range 24–25.5, underlaid by a 2D histogram that represents the local star density (stars per 156 arcsec²). The cross marks the nominal center of the galaxy and the circle has a radius of 50′′ (=200 px). The left panels of Fig. 6 shows the CMD of all stars detected within that radius. The two outer circles (dashed lines) define an annulus with the same area as the inner circle. This area is used for statistical decontamination of the CMDs, and the annulus has the inner radius at the location corresponding to four times the effective radius (Müller et al. 2015) of the corresponding galaxy. Stars in the annulus were used to construct the CMD of Galactic foreground stars in the direction of the dwarf galaxy.