Comparison of the physical properties for our sample of dwarf galaxies. Top left: V-band luminosity L_V versus the half-light radius R_e. Top right: L_V versus the global average metallicity [Fe/H]; the green band is the L_V-[Fe/H] relation from Kirby et al. (2013). Bottom left: R_e versus the velocity dispersion σ_v. Bottom right: luminosity L_half at the half-light radius versus the calculated dynamical mass M_half at the same radius; dashed black lines indicate constant M/L ratios of 1000, 100, 10 and 1, from left to right. In all panels, on- and off-plane systems are represented by orange triangles and blue circles, respectively, while uncertain systems are represented by grey squares. The LMC and its probable satellites are marked with black circles, while green circles mark systems being in the off-plane sample independently of their proper motions.