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Fig. 1


a) Mid-infrared Spitzer composite image (red: 8 μm; green: 4.5 μm; blue: 3.6 μm) of SDC335. The 6 filaments identified by eye are indicated with yellow dashed lines, emphasizing their converging pattern. The diffuse 4.5 μm emission associated with the two IR sources in the centre is usually interpreted as a signature of powerful outflow activity. The positions of the two cores are marked with black crosses. b) Herschel column density image of SDC335. The locations of the filaments and cores are marked similarly as in the a) panel. The final angular resolution of this image is 25′′ (yellow circle), that of Herschel at 350 μm (see text). The contours range from 3.5 × 1022 to 9.5 × 1022 cm-2 in steps of 2 × 1022 cm-2, and from 2.15 × 1023 to 4.15 × 1023 cm-2 in steps of 1 × 1023 cm-2. The two yellow contours define the regions in which we calculated the SDC335 and Centre region masses quoted in Table 1. c) ALMA 3.2 mm dust continuum emission of the central region of SDC335 where two cores are identified, MM1 and MM2. The rms noise is 0.4 mJy/beam. The contours range from 2 to 22 in steps of 5 mJy/beam, and from 22 to 62 in steps of 10 mJy/beam. The yellow ellipse represents the ALMA beam size.

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