Polarization fraction as a function of the H₂ column density of the cloud for various projection angles. As expected, the polarization fraction is systematically lower, as the angle between the LOS and the mean component of the magnetic field becomes smaller. However, even when observing the cloud “face-on” (ϕ = 0^∘) the polarization is non-negligible, albeit the polarization fraction is probably overestimated for all projection angles.