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NGC 6871Bell et al (2013).
In Bell et al. (2013) we presented ugriz data for 13 clusters which we used to measure their ages.
We also obtained data for a further four clusters in the same runs which we did not use in that
paper.
If you wish to cite these data, simply say they were obtained in the same runs, and reduced in the
same way as the data in Bell et al.
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