The CMD (g − r vs. M_r) of the MIRONG sample (blue filled circles). The magnitudes and color are displayed after correction for Galactic dust extinction and k-correction to z = 0.1. We denote the four SN host galaxies in red. Contours show the density of low-redshift (z < 0.2) SDSS DR7 spectroscopic galaxies. The contour lines correspond to 5, 25, 100, 400, 2000, 5000, and 8000 galaxies bin^–1 of Δ(g − r) = 0.1 and ΔM_r = 0.1. The magenta dashed line is the assigned line of demarcation between the blue clouds and red sequence. We have also plotted the optical TDEs (van Velzen et al. 2020) for comparison (green squares), in which the magnitudes are from either SDSS or Pan-STARRS.