Panel a): correlation of the SMI with the HBR index () for our sample of Galactic GCs. HBR values are taken from the latest version of the Harris (1996) catalogue. The continuous line is the relation between and from Preston et al. (1991), reported in Eq. (1). Panel b): correlation of SMI with the integrated ultraviolet-optical color (NUV − V)0 for Sample A (open stars), Sample B (open triangles, to be considered as lower limits), and Galactic GCs (small filled circles).
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