(q_V, u_V) − µ plane for the polarization data in Panopoulou et al. (2019b). Top and bottom panels correspond to their 1-cloud and 2-cloud regions, respectively. The relative Stokes parameters q_V’s are shown by dark green circles and the u_V’s are shown by blue diamonds. Vertical and horizontal errorbars show the 68% confidence level on measurements on polarization and distance modulus, respectively. For visualization purposes we omit to show two stars at distance modulus 1.6 and 18.6 in the 1-cloud region.