Left: the μ₀ − M relation in the V-band (see text for conversion formula) for our candidates (black squares), the known dwarfs of the M 83 subgroup (gray filled squares) and LG dwarfs (dots,  McConnachie 2012). Right: the same for the effective radius, log r_eff, instead of central surface brightness. Conservative global error bars of 0.5 mag for M, 0.3 mag for μ, and 0.05 for log r are plotted. Absolute magnitudes assume a distance of 4.9 Mpc (M 83). The curves indicate the completeness limit of the present survey on the assumption that every candidate larger than 40 arcsec in diameter within an isophotal level of 28 mag arcsec^-2 is included (see text).