The dependence of polarization on orbital phase at 1.5 GHz (upper panel), 5 GHz (middle panel) and 9 GHz (lower panel). Data were imaged in all four Stokes parameters in 10, 10 and 6 min time bins respectively (i.e. averaging over beat period behaviour). We show the circular polarization percentage (Stokes V∕I) and the total linear polarization percentage (), as well as the Stokes Q and U terms. An identically zero polarization indicates that imfit was unable to identify a source at the location of AR Sco in that Stokes parameter.