Representation of our models computed with the data presented in Sect. 2.1. Left: image of the mock galaxy model (Gal_mock). Right: radial profiles of the mean model (Gal_mean) as a blue solid line, the mock model (Gal_mock) as an orange dotted line, and the sky background with the instrumental noise as a solid green line. The effective radius R_eff is shown as a red circumference (left) and a vertical line (right).