Multithermal view of an EUI brightening (E-1) obtained on 23 February 2021. Panels a and b: time-slice plots of HRI_EUV images with full and degraded (to SPICE spatial and temporal) resolution. Panels c–f: time-slice plots of the intensity from the Gaussian fitting results of Ne VIII, C III, Lyβ, and O VI. Orange boxes mark the position in which the EUI brightening appeared. The curves at the top of each panel show the intensities at this position vs. time. The error bars were calculated from the errors of the fitting parameters and are plotted in orange.