Main frames showing the event on September 11, 2021. CME front of the event on September 11, 2021, can be seen in the VL pB base differences in the red-colored frames (a)–(c) and in the three simultaneous blue-colored (g)–(i) UV frames below, processed via the SiRGraF algorithm (Patel et al. 2022). The base frame is at 01:03 UT. The eruptive prominence is visible in both channels starting from 10:15 UT. The temporal evolution in both channels is available as an online movie (pb_20210911.mp4 and UV_20210911.mp4).