Fig. 18
Variations with azimuthal angle of the magnetic pitch angle in M 101 averaged in 10° sectors in the rings 
and 
, compared to the variations expected if the magnetic field is aligned with H i of the model filaments. The azimuthal angle is counted counter-clockwise from the NE major axis. The pitch angles are corrected for the inclination as well as for the Faraday rotation.
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