Herschel column density map at 18.2′′ resolution overlaid by grey streamlines displaying the plane of the sky B fields which were computed using the 353 GHz observationsfrom the Planck mission. Thespatial resolution of the Planck data is 4.9′ (as shown by the grey circle in the lower left of the image). The Stokes Q and U components were used to obtain the B-field position angles. The results are displayed as grey streamlines by using streamplot in matplotlib, as thicker lines for the signal-to-noise ratio, S∕N > 2.5, and thinner ones for 2.0 < S∕N < 2.5.