(a) CMD from Pan-STARRS photometry. Spectroscopic members are shown as large blue points, and non-members are red crosses. The cyan curves show 14 Gyr Padova isochrones (Girardi et al. 2004) at the distance of Tri II. The two isochrones have metallicities of ﹩[\mathrm{Fe}/{\rm{H}}]=-1.23﹩ and −2.23. (b) The map of spectroscopic targets. The DEIMOS slitmask outlines are shown in green.