Fig. 12.
Pseudo-chromosome map and histograms of the ΔF438W−F814W colours for P1 and P2 stars. The thin orange histogram indicates the errors as determined from artificial star tests. The arrows show the effect of changing the He abundance by ΔY = 0.15, the overall metallicity by Δ[Z/H] = +0.1 dex, and the CNONa abundances by Δ([(C, N, O, Na)/Fe]) = −0.6, +1.44, −0.8, +0.8 dex (Sbordone et al. 2011).
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