Average temperature scans 16–20 (left to right) inferred from the NICOLE inversions of the Ca ii 8542 Å line between the heights of log τ ∈ [−2.4,−3.0]. The time corresponds to the midpoint of each scan sequence. The impulsive phase starts at 08:37 UT. Overplotted black contours, marked with numbers 2–3 in the left-hand panel, show cumulative GFPI Ca ii line-core enhancements between 08:37–08:39 UT. The black contour marked with 1 encompasses a dark filamentary structure seen in the GFPI Ca ii line-core images. AIA 131 (green) and AIA 1600 Å (blue) contours show brightenings at 08:37:56 and 08:37:28 UT, respectively. The black area at the bottom of the panel at 08:37:26 UT does not show information on the inversions owing to bad fits (χ² exceeds threshold criterion). The FOV corresponds to the black rectangles shown in the GFPI panels of Fig. 2.