(a) TSM or the magnitude of the translational pixel shift between the HRIEUV and AIA images after remapping to Carrington longitude-latitude coordinates as a function of height for HRIEUV (x-axis) and AIA (y-axis). These heights describe the surface we used to map to spherical coordinates, and they are shown in R_⊙ and Mm. The cross shows the minimum of the surface. Panels (b) and (c) show TSM as a function of height for cuts passing through the minimum point, shown by the dotted horizontal and vertical lines in panel (a).