Distribution of the WD binary candidates and the sample of general WDs on HRD (BP-RP vs. absolute G). WD binary candidates less than 0.45 M_⊙ are represented by red dots, WD binary candidates greater than 0.45 M_⊙ by blue dots, and the total sample of DA WDs by black dots. DWD J151343.50+443436.40 is represented by a green triangle and WDMS J003221.88+073934 by a black pentagon. The solid black line shows a color-cut and absolute magnitude selection scheme for searching for WDs using Gaia data proposed by Gentile Fusillo et al. (2019). The dashed red lines show the selection scheme for searching for WDMS candidates based on Gaia EDR3 data by Rebassa-Mansergas et al. (2021).