Fig. 16.
Variation of τHB as a function of cluster metallicity (Carretta et al. 2009). The red line shows the quadratic best fit, the blue lines show 1.5σ levels. Red squares display the outliers, which are those objects located at more than 1.5σ from the quadratic fit. In the left corner the error bar shows the 0.1 dex error on the metal content.
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