Comparison of B −  V, V − I _C , J −  H, H − K _S , K _S − W1, and K _S − W2 vs. V − K _S of young stars from β Pic, η Cha, TWA, and Tuc-Hor moving groups (circles) with the dwarf color locus described in Appendix C and the giant color locus from Bessell & Brett (1988), except the B −  V giant locus, which is from Alonso et al. (1999). Spectral types corresponding to the V − K _S colors of dwarfs are plotted along the top. Objects with a known near-IR or IR excess have been excluded (see Table 1).