Height above the photosphere of the 16 campfires measured using the manual method versus their projected length (triangles with their error bars, h ± δh). The HRI_EUV image taken at 14:54:10 UT is used. Each panel shows the triangulation results for different values of the CRVAL1 offset. The black line in each panel represents the height corresponding to the half of the projected length, as we would expect for a semi-circular loop, for comparison.