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Fig. 1
Ca II line strength plotted against Ks magnitude for VVV clusters in S12 and R97 catalogs. The vertical bold line at Ks = 12 is the saturation limit for the VVV survey. Vertical bars on each point show the measurement uncertainty in the line strengths. The measurement uncertainty in magnitude is too small to be noticed.
This figure is made of several images, please see below:
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