Arot/σ0 ratio in a number of GCs as a function of different cluster parameters: horizontal branch morphology (left panel), [Fe/H] (mid panel), and IQR[Na/O] (right panel). The Spearman rank correlation coefficient is shown in the upper right corner of each panel. Rotation data are taken from Bellazzini et al. (2012). NGC 4372 has a red star symbol.
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