Color–magnitude diagrams and histograms of Δ(u − g)₀, Δ(u − i)₀, and Δ(J − K_s)₀ for stars in the field of (l, b) = (0.0°, −7.5°). The Δ-colors are derived as the difference between the original color and the fiducial line (purple lines in the left panels), and the histogram is respectively drawn for stars within the 1.0 mag range from 10.0 to 15.0 mag in K_s0-band. Both the bRC and fRC stars show bimodal distributions in Δ(u − g)₀ and Δ(u − i)₀. However, the majority of the bRC is in the redder side, whereas that of the fRC is in the bluer side. In contrast, the bRC and fRC show similar distributions in the Δ(J − K_s)₀.