Input R_e as a function of the input total magnitude in I_E (left panel) and the corresponding histogram of the input SB_e (right panel), colour-coded according to their detection or non-detection by eye in the three types of products: NOBG, VIS BGSUB, and the final MER mosaic subtracted by VIS and MER backgrounds. Only the non-nucleated dwarfs, at all distances, have been used in this analysis. We labelled the number of dwarfs that are visually detected in each SB_e bin. The dashed rectangle shows examples of objects that were detected differently with the various background treatments.