Structural and photometric parameters for the newly discovered UDGs (filled magenta circles) as a function of the effective radius. Symbols are the same as Fig. 3. The UDG definition criteria, R_e ≥ 1.5 kpc and μ₀ ≥ 24 mag arcsec⁻² (van Dokkum et al. 2015), are shown by the dashed lines. The vertical shaded region indicates the range of uncertainty on R_e given by the uncertainties on the cluster distance.