Integrated absolute V magnitude vs. the logarithm of the half-light radius for dwarf galaxies in the most recent version of the M12 catalogue (filled circles). The mean M_V vs. log R_h relation by Brasseur et al. (2011) is plotted as a continuous line; the curves bracketing ± 1σ and ± 2σ range about that relation are plotted as dashed and dotted lines, respectively. The middle, unshaded area of the figure highlights the range of M_V considered here. Large empty circles indicate the synthetic dwarf galaxies under study (see also Fig. 2).