Dynamic spectra, sectored intensity time profiles, and pitch-angle coverage of EPT for the events seen on 10 and 11 December 2020 for ions (upper part) and electrons (bottom part). SIS and HET measurements in the upper part are for protons only, while STEP and EPT show data for all ions. The activity starting around 11:00 on 11 December (4) and the one visible in the low-energy STEP ion data that precedes the event on 10 December (5), are not associated with this solar event. Ion contamination of the electron measurements appears at high energies around 06:00 on 11 December 2020 and it is highlighted surrounded by an ellipsoid in panel d; the ion population causing this signal is equally indicated in panel a.