Two-dimensional density map in Galactic coordinates of Gaia sources after the parallax and PM selections. The darker colors indicate denser regions. Iso-density contours at 0.5σ (solid), 1σ (dashed), and 1.5σ (dash-dotted) are shown in black. The cluster positions and names are marked. The density map was obtained through Gaussian kernel density estimate using the gaussian_kde function of the scipy Python package (Virtanen et al. 2020).