Top: Location of the targeted inner fields (red rectangles) on a star count map of M31 (courtesy of M. Irwin). Shown as blue squares are the HST fields of Brown et al. (2003, 2006, 2007). The solid black lines delineate the region in which we detect a break in the abundance profile (see Figs. 14–16); this transition occurs remarkably close to the edge of the perturbed disk component in the star count maps. Bottom: Representation of the full data set in standard coordinates. Numbers at the top denote projected distances from M31 in kpc, also indicated by dashed circles. The individual masks are color‐coded by their metallicity (see § 7). The black diamond represents the Stream field H13s (Kalirai et al. 2006a), black circles are the HST fields, and M31 and M33 are indicated as crosses. Dashed ellipses illustrate the approximate location of the tangential streams found in the Ibata et al. (2007) maps.