Corner plots for the simultaneous fit of both observations including the unpulsed polarization component contribution (parameters correspond to a set of solid lines in Fig. 3e and lines in Fig. 6). The RVM parameters i_p, θ_p, and χ_p are in degrees. The Stokes parameters Q_c, i and U_c, i are expressed in percent of the average flux, while I_c, i are fractions of the average flux. The uncertainties are reported at a 1σ confidence level.