Fig. 15.
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[Fe/H] indices of RR Lyrae stars in M80, against their pulsation periods. Black squares show the spectroscopic values from the Magellan observations. Red and blue points show the different photometric estimates. The gray band refers to the spectroscopic [Fe/H] determined from red giants by Carretta et al. (2015). Abbreviations N13, JK96, and M07 refer to Nemec et al. (2013), Jurcsik & Kovács (1996), and Morgan et al. (2007), respectively.
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