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Published online by Cambridge University Press: 19 July 2016
At a meeting on globular clusters held five years ago, Zinn (1981) made the following comments:
“In summary, there are clearly large differences in metal line strength between 47 Tuc giants and the giants in the other clusters. These differences suggest that there are substantial differences in metal abundance, which conflicts with the measurements obtained from echelle spectrograms, and there appears to be no simple way of reconciling these results. Until this is done, the metallicity scale for globular clusters hangs in limbo.”