Polarization spectra of the SMC WR objects. Stokes I spectra are shown in the lowest panels of the triplots, the levels of %Pol in the middle panels, whilst the PAs (θ; see Eq. (2)) are plotted in the upper panels. The data are rebinned such that the 1σ error in the polarization corresponds to 0.1% as calculated from photon statistics. In the lowest panels, the PA is sometimes seen to flip with wavelength by 90 degrees owing to small changes between QU quadrants when the observed polarization level is close to zero.