Polarization fraction in emission for oblate grains (axis ratio b/a = 1.1) that are perfectly aligned in the plane of the sky. Results are presented for log-normal (top) and MRN-like (bottom) size distributions. The grain size corresponding to the peak of the mass distribution is indicated in μm. Negative polarization fractions correspond to a rotation of the polarization vector by 90^°. The wavelength of ALMA bands 3, 6, and 7 are indicated with dashed vertical lines. Mean values of the polarization fraction observed for [BHB2007] 11 are overplotted in positive and negative for the log-normal size distributions.