Heliocentric velocity (v _helio) vs. photometric metallicity ([Fe/H]_phot) for M31 RGB stars (black points) in the NE shelf fields, where projected M31-centric radius (R _proj) increases from left to right and top to bottom. We show the 1σ (2σ) radial velocity range of KCC1 (red) and KCC2 (orange) (Table 3; Figure 5) as dark (light) shaded regions. The [Fe/H]_phot distributions across the various NE shelf substructure components are similar. Stars assigned to the stellar halo component also have similar [Fe/H]_phot to the NE shelf.