Comparison of loop widths from two vantage points. For visualization purposes, we selected a single HRI_EUV snapshot for each loop at its peak brightness. The top left panel displays the average of these nine snapshots. The black lines indicate slit positions used for width calculations in the HRI_EUV data. Panels (1)–(9) plot the intensity profiles for the individual loops (numbered 1–9) corresponding to the positions in the top left panel. Measurements in black (HRI_EUV) and blue (AIA 171 Å) represent the loop widths as described in the caption of Fig. 2E. These loop widths are tabulated in Appendix D.1