Difference in [Fe/H] as a function of [N/Fe], with the cluster mean for 1G stars ([N/Fe] < 0.7) taken as the zero point: red = Terzan 2, magenta = Djorg 2, cyan = HP1, yellow = NGC 6540, blue = Terzan 9, orange = Terzan 4, green = NGC 6642. Symbol size is directly proportional to T_eff. A clear trend is found for 2G (higher [N/Fe]) stars to have both a higher T_eff and [Fe/H] than 1G stars in the same cluster.