Scaling relations (r_eff – M) and (μ₀ – M) for the newly discovered dwarf candidates (red squares), previously discovered dwarf members (gray squares), and the Local Group dwarf galaxy population (gray dots). The estimated conservative completeness limit, as derived in Müller et al. (2017b), is indicated with the line. The UDG candidates discovered in Coma (van Dokkum et al. 2015) are overlaid as black dots in the (r_eff – M) diagram; also overlaid is the size cut (dashed line) of 1.5 kpc for UDGs.