Fig. 2
Color of the RGB as function of metallicity, based on the fitted RGBs. Black circles are for the color at MF814W = −3.5, orange diamonds for MF814W = −3.0. Small dots are for clusters without individual alpha measurements. The solid lines are the best-fitting functions as given in the upper left corner and the lighter contours show the 1σ, 2σ and 3σ regions of the fit.
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