S-band SED of QS Vir on 28 Nov. 2022 in Stokes I (a) and V (b), binned in time as in Fig. 5 with 16 frequency bins. All times are UTC. We do not trust the variation in flux near 4 GHz because it lies near the edge of the frequency band. Similarly to Fig. 6, a spectral feature centred on 3.5 GHz rises to a maximum at 15:42:52 and decays from 15:45:25. This peak is maximally circularly polarised at 15:42:52 (55 ± 10%) and decreases at 15:45:25.