Fig. 2
Density map in logarithmic scale of the photometric differences in Ks between 2MASS and VSp catalogs, as a function of Ks magnitude obtained with the VVV-SkZ_pipeline (VSp, upper figure for NGC 6553, lower figure for NGC 6656). No systematic offset exists, especially for the brighter (Ks < 12) stars, which are saturated in the VVV data.
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