Circular polarisation fraction of QS Vir in all epochs. Each frequency band was separated into 4 sets of spectral windows and imaged separately. The top panel, November, is missing a data point in S-band due to the first 4 spectral windows being flagged for radio frequency interference (RFI). The negative-most point (49 ± 5% LCP) in the bottom panel, January, corresponds to the range of the peak frequency in the bottom panel of Fig. 1 (3.2 GHz).