Left column: orthographic projections of the Planck 353GHz D₃₅₃ (StokesI) map (top row) and the square of the polarization intensity P² (bottom row), at 1° resolution over the southern Galactic cap covered by the GASS H I survey, with the selected region SGC34 outlined by a black contour. The same coordinate system is used as in Fig.1. Right column: similar to left panels, but for a realization of the 353GHz dust model. Judged visually, the dust model is able to reproduce roughly the observed dust polarization sky over SGC34, and indeed over the entire field shown.