Fig. 9.
Similarly to Fig. 7, the sum of the equivalent widths ΣEW of the two strongest Ca lines is plotted over V − VHB for all RGB stars. Quadratic fits to each individual cluster are shown in orange, while a global fit, where the same values for β and γ are used (giving β = −0.442 ± 0.002 and γ = 0.058 ± 0.001), is plotted for each cluster in blue.
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