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Fig. 4

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Filament position angle versus degree of asymmetry (see text and Fig. 2). Only filaments with asymmetry parameter errors  <30% and PA uncertainties  <30° are shown. The blue triangles correspond to the two filaments shown in Fig. 2. Filaments with  −40° < PA <  +10° are more asymmetric with more material towards the eastern part of the Pipe (i.e. away from the direction of the Sco OB2 association). The shaded area shows the location of symmetric profiles (within a 30% variation from symmetry). The vertical solid red line corresponds to the average orientation of the magnetic field in the region and the vertical dashed lines mark a  ± 1σ deviation of the magnetic field angles.

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