ForeCAT and FIDO results for Event 1 plotted in panels a and b, respectively. The FIDO results are shown against PSP magnetic field and plasma data. The thicker contours represent the model output using a PFSS with R_ss = 2.5 R_⊙. The thinner contours represent all other PFSS source surface heights. The four different colors correspond to different input magnetograms. If a given combination of input magnetogram and PFSS source surface height resulted in a “miss” according to OSPREI, it was not included in the FIDO plot (see text for details).