I − (V − I) CMDs of the resolved stars within the tidal radius of Virgo UFD1 (a) and the control field at 2.5 × r_tidal ⩽ r < 4.0 × r_tidal that are 10 times larger than the galaxy field (b). (c) The net CMD of the galaxy field obtained after statistical subtraction of the field contribution. ((d), (e), and (f)) Same as (a), (b), and (c), except for Virgo dSph-D07. Curved lines denote the 12 Gyr stellar isochrones for [Fe/H] = −2.4 to 0.0 in steps of 0.2 provided by the Dartmouth group (Dotter et al. 2008), shifted according to (m − M)₀ = 31.08 and E(V − I) = 0.031.

(A color version and supplemental data of this figure are available in the online journal.)