Our final samples on the Gaia CMD (colored symbols). Different types of binary systems identified by Ren et al. (2023) are denoted by different colored symbols. The black dots denote Gaia samples within 100 pc with small errors. The region outlined by cadet dashed blue lines was set by Ren et al. (2023) to select their candidates. The color-shaded regions indicate the locations of gold samples (CVs-green, DWDs-blue, WD+AFGK-orange, WD+M-red) compiled by Inight et al. (2021).