Variation along the distance of the normalized probability density distribution of the cloud distances (top) and of the differentials of the Stokes parameters δq and δu (middle and bottom) obtained from the marginalization of the full posterior distributions in distance bins for 15 sightlines as explained in the text. The moving-window length of 10 pc is adopted. The curves are smoothed with a Gaussian kernel that varies with distance as explained in the text. The same color corresponds to the same LOS across panels.