Top panels: variation of the relative fractions of the mass of the galaxy and of the stars in the RGB and AGB boxes for the δm_RGB = 0.25 M_⊙ case, based on the SFH by Weisz et al. (2014) for Sculptor (top left) and NGC185 (top right). Bottom panels: cumulative contribution of various star formation epochs to the present-day ratio of AGB-to-RGB stars of Sculptor (bottom left) and NGC185 (bottom right), based on different assumptions regarding the star formation history and the average mass lost by low-mass stars during the RGB phase. Solid lines indicate results found by adopting the SFH by Weisz et al. (2014) for Sculptor and for NGC 185. The colour-coding and the dashed and dotted lines have the same meanings as in Fig. 5.