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Fig. 1


Spitzer three colour image of the IRDC SDC335. Colour scale: red, green and blue GLIMPSE images at 8.0, 4.5 and 3.6 μm respectively. White contours: ALMA 3.2 mm continuum, with contours at 3, 10, 25, 50, 75 and 90% of the peak flux. Green , Class II CH3OH masers. The yellow dashed lines outline the filaments of SDC335, following Peretto et al. (2013). (Colour online.)

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