De-trended Doppler shift signals, on which the figure of merit is based, for the SPICE observations used in the previous PSF work in Paper I and Figure 5. The subpanels show the resulting Doppler shifts from different shift parameters, noted above each subplot. With the highest quality Doppler shift correction around Δx = 2 arc second/Å and Δy = −2 arc second/Å this figure is consistent with the automated search determination of [2, −1.667], as shown in Figure 7.