Slit-reconstructed Hα line-core intensity maps (rows 2 and 5) for all 20 scans, along with the corresponding maps of the blue (rows 1 and 4) and red (rows 3 and 6) line-wing intensity at ±1.0 Å observed on 11 September 2018. The image contrast of the line-core, and blue and red line-wing intensity maps are in the ranges 0.15–0.80, 0.25–1.4, and 0.25–1.4 I/I₀, respectively. All maps depict the region of interest of 100″ × 100″shown in the top panels of Fig. 2. Two locations along the surge are indicated in panel seven of row 2 as S₁ and S₂, which are discussed in Sect. 3.6 and depicted in Fig. 10. The accompanying online movie furnishes a detailed view of ongoing dynamics in the active region.