Residual cross-correlation shifts after co-registration, computed in tiles of 64 × 64 pixels, in the x (panel a) and y direction (panel b). The number at the center of each tile is the co-registration shift for that tile, in units of SO/PHI-HRT pixels. Tiles where the cross-correlation procedure did not converge are marked in red. In both panels, the 400 G isoline of the SO/PHI-HRT |B_los| is drawn as a solid yellow line.