Fig. B.1.

Comparison of the Herschel/SPIRE 250 μm image of Polaris at the native beam resolution of 18.2″ (panel a –see Miville-Deschênes et al. 2010) with the filament-subtracted image of the same field, panel b obtained with the getfilaments algorithm (Men’shchikov 2013) and used as a “filament-free” background image in the numerical experiments shown in Figs. 5 and B.2.
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