Radial velocity v_r and components of the s_r decomposition evaluated on a spherical surface centered on the star with radius 2.5, R_⋆; the planet in this setup orbits at 5, R_⋆. Panel (a) shows v_r; panels (b) and (c) show the two terms on the right-hand side of equation B.5; panel (d) shows their difference. The shaded region in panel (d) corresponds to the zoomed-in regions of Fig B.2. All values are in code units.