Fig. 6.
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SMI vs metallicity diagram. The nine M31 GCs are plotted in orange. The GGCs are plotted as black circles. The SMI for the GGCs is a combination of data from Perina et al. (2012) and Lee et al. (1994). The Lee et al. (1994) HB ratio values were converted to SMI using the Preston et al. (1991) relation. The GGC metallicities were taken from Harris (1996, 2010 edition) The GGCs that have WAGGS spectra (Usher et al. 2017) are shown as open black circles.
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