Comparison of color-magnitude diagrams of unresolved sources selected from Rubin DP1 (top row), TRILEGAL simulation (middle row), and DES and DELVE data (bottom row). Each column corresponds to one of the Rubin DP1 fields (as designated in the top left corner of each panel). The color scale follows the probability density. While bin sizes are smaller in the rightmost column, the same color scale is shared between all panels. TRILEGAL, DELVE, and DES data have been selected so that the area of each field is equal to the approximate area covered by the corresponding DP1 fields. Recall that r < 24, star-galaxy separation and 0 < g − r < 1.4 selection criteria were applied. DELVE data contain only a few stars fainter than r≈22. We call attention to the deficit of faint (r > 22) blue stars (g − r < 0.6), compared to TRILEGAL simulation, in all three fields.