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Fig. 2


Two views of the filamentary structure of the Musca cloud showing the striations and strands. Several specific features are indicated with cyan arrows. Top: Herschel/SPIRE 250 μm map of the Musca cloud with a “arcsinh” intensity scaling set to enhance visibility of the faint striations. Bottom: curvelet component image of the SPIRE 250 μm map (“arcsinh” intensity scaling) produced with the Morphological Component Analysis software from Starck et al. (2003). The crest of the main filament derived with DisPerSE is shown in cyan. This procedure enhances the contrast of the filamentary structure, by removing most non-filamentary background emission. The hair-like strands in the immediate vicinity of the main filament stand out in this close-up view corresponding to the dashed cyan rectangle indicated in the upper panel. The star symbol indicates the position of the young stellar object detected at 70 μm (FK5 12:35:16.35, 70:39:56.94 (J2000)). Equatorial north-east directions are indicated by the compass in the upper right.

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