Continuum polarization P for aspherical configurations in scattering dominated atmospheres with an electron distribution  ∝ r^-3. Upper panel: maximum linear polarization as a function of the optical depth for oblate (solid blue) and prolate (dashed red) ellipsoids. Lower panel: P as a function of the inclination for a source located off-center, at a distance D = R_ph/R of 3 (solid blue) and 1.5 (dotted red) (adopted from Höflich et al. 1995). Note that D = 3 corresponds to SN 2005ke at day  − 8, when the photosphere R_ph is formed at about 10 000 km s^-1, and assuming the maximum off-center ⁵⁶Ni distribution suggested by Maeda et al. (2011) for core-normal SNe Ia.