HRIEUV (top-left panel) and EIS images centred around the event E₁₀, on 2023 April 4 (S₃). The HRIEUV image is taken at the time closest to that of the EIS slit position indicated by dashed white lines. The event region (red), along with the background regions 1 (orange) and 2 (purple) are displayed as rectangles. These regions are defined in Sect. 3.1.2. The temperature log T of the maximum emissivity of each line is indicated inside parenthesis on top of the image. The white arrow in the Fe XI image indicates the large coronal loop standing above E₁₀.