Parameters used in the scorecard to rate the likelihood of a system of being a period-bouncer. See Sect. 4.2 for explanation of markers and color scale, as well as the justification of the selection cut lines. Panel a: WD effective temperature as a function of orbital period for 80 systems in our literature catalog with available information. Panel b: Gaia variability as a function of orbital period for 159 systems in our literature catalog with available information. Panel c: Gaia color –magnitude diagram showing the position of the 145 systems in our literature catalog with available information. The Gaia-DR3 sources with Bailer-Jones et al. (2021) distances and a parallax error of less than 1% of the parallax value are shown in gray as a reference. Panel d: SDSS color –color diagram showing the position of the 83 systems in our literature catalog with available information. Panel e: FUV-NUV color as a function of orbital period for 91 systems in our literature catalog with available information. Panel f: IR color –color diagram showing the position of the 45 systems in our literature catalog with available information.