Yong, DavidAlves-Brito, AlanDa Costa, GaryAlonso-Garcia, JavierKarakas, AmandaPignatari, MarcoRoederer, Ian U.Aoki, WakoFishlock, CherieGrundahl, FrankNorris, John2015-12-100035-8711http://hdl.handle.net/1885/69387With the exception of Terzan 5, all the Galactic globular clusters that possess significant metallicity spreads, such as ω Cen and M22, are preferentially the more luminous clusters with extended horizontal branches. Here we present radial velocities andAuthor/s retain copyright201410.1093/mnras/stu1182015-12-10