Relative orientation parameter (ξ, top), projected Rayleigh statistic (V, middle), andmean relative orientation angle (, bottom) as a function of the slope of the N_H distribution (α, Eq. (10)) within the last closed contour of the studied regions before (left) and after (right) the selection criterion > 20°, where and are the meanB_⊥ orientation angles insideand outside the largest closed N_H contour, respectively.