Blow-ups of Fig. 1 showing the column density images of a portion of the Stem (left) and the B59 (right) regions over which the filament networks as traced by the DisPerSE algorithm are plotted. On these images, we can see better the “grid-like” pattern in the Stem, and the converging pattern of B59. The direction and length of each arrow show the direction and amplitude, respectively, of the asymmetry in the corresponding column density profile, for filaments having −60° < PA < +30° and asymmetry uncertainty better than 10%.
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