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Fig. 2


3.2 mm continuum images of the IRDC 18223 filament. The left panel is imaged with natural weighting and a resulting synthesized beam of 5.6′′ × 3.27′′  with a position angle of −6° whereas the right image is conducted with uniform weight and a synthesized beam of 4.37′′ × 2.84′′  with a position angle of 187°. The contour levels in both images start at the 3σ level of 0.39 mJy beam-1, continuing in 3σ steps until 1.56 mJy beam-1 (the same are shown as dotted lines for negative features). Then they continue from 2.34 mJy beam-1 in 1.56 mJy beam-1 steps. The red markers and line in the left panel outline the main continuum peak positions and guide the eye for the filament structure. The synthesized beams and scale bars are shown in both panels at the top-right.

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