Angle difference between the B-field orientation and the tangent to the 100 pc ring as defined in Molinari et al. (2011) as a function of the phase angle along the ring (black dots). The red and blue profiles show the corresponding 240 μm intensity and polarization fraction profiles in arbitrary units. The horizontal lines show the range ± 20°. The verticalboxes show the tangent point of the ring.
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