(a) Δ([Fe/H]) (difference in [Fe/H] from the mean based on only 1P stars = those with ([N/Fe]<0.7) as a function of [N/Fe]. A clear trend is found for 2P (higher [N/Fe]) stars to have a higher [Fe/H] than 1P stars in the same cluster, with the difference in metallicity increasing with increasing [N/Fe] for 2P stars. The best-fit line is shown for 2P stars. (b) As in a) but for [Mg/Fe]. (c) As in a) but for [Si/Fe]. (d) As in a) but for [Ca/Fe]. The stars are color-coded according to metallicity in each panel.