Temporal evolution of a QSEB observed at μ = 0.54 on 16 August 2020. On the left, a series of small images are centered on a QSEB (from the top to bottom row) in the Hβ wing, the Hε line center, the difference Hε − Ca II H blue wing, and WB 4846 Å. The λt diagrams to the right show the spectral evolution at the pixel location marked with a cross in the Hβ wing and Hε images. The colored markers indicate the times for which spectral profiles are shown on the right. An animation of this figure is available online.