X indices using all wavebands X_ZYJHK for ED and D_σμ. The X(ED) index was computed using the Strateva function without sample size correction for BA photometry, while X(ED) was computed using the Strateva modified function with sample size correction for the BAS approach. The histograms of the entire sample (black lines) and WVSC1 stars (red lines) are shown at the top right. The WVSC1 stars are also represented by open black circles and the maximum number of sources per pixel is shown in brackets.