Observed CMDs for objects with different classifications from the reduction package: a) stellar sources on both filters (55025 points); b) extended sources in both filters (151924 points); c) stellar on the J and extended on the Z tile (27687 points); d) and extended on the J and stellar on the Z image (18932 points). In panel a) the open (orange) circles show the evolutionary path of a simple stellar population (SSP) model with metallicity Z = 0.008 as the population ages. The size of the circles increases with the age of the model plotted at (4, 10, 30, 100 and 300) Myr and at (1, 3 and 10) Gyr. The model was obtained using the CMD online tool by L. Girardi at stev.oapd.inaf.it/cmd, and refers to an SSP born with 10⁵M_⊙ of stars distributed between 0.1 and 100 M_⊙ with a Salpeter IMF flattened below 0.5 M_⊙.