Effects of nonradial components on the predicted plasma line-up. Panels (a) and (b) show the Vp,_T and Vp,_N proton bulk speeds (red and purple curves, respectively) measured at PSP and Solar Orbiter for the same time intervals as in Figure 8. Panels (c) and (d) are the outcomes of the propagation method, as in Figure 5, including some nonradial components. The gray curves correspond to purely radial propagation, the red and purple curves correspond to propagation with nonzero T and N velocities and acceleration, respectively, and the black curves correspond to propagation with T and N components. For each propagation vector, the minimum distance d_MIN is marked by vertical dashed lines of matching color. The radial velocities and acceleration are the same as in Figure 5.