Corrected absolute Gaia magnitude M_G0 versus orbital period P_orb (upper) and Gaia color G_col0 (lower). Regarding WZ Sge-type DNe whose orbital periods are unknown, we estimated the orbital periods from the superhump periods and equation (6) in Kato et al. (2012b). The filled squares, circles, and stars represent SU UMa, WZ Sge-type DNe, and ASASSN-14dx, respectively. Three WZ Sge star candidates mentioned in subsection 4.3 are shown by filled triangles. The solid line in the lower panel indicates P_WZ = 0.5, which represents the borderline between SU UMa and WZ Sge stars. (Color online)