Left panel: boxplot of the αml estimated by means of a grid of models identical to AS09 but with no change on the surface [Fe/H] with respect to the ZAMS value. The adopted ΔY/ΔZ is 1.0. Middle: same as in the left panel, but adopting ΔY/ΔZ = 2.0 in the recovery. Right panel: same as in the left panel, but adopting ΔY/ΔZ = 3.0 in the recovery.
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