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Fig. 3

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Comparison of channel maps H2CO 9(1, 8)–8(1, 7) (top row) with 12CO 65 (bottom row) (data taken from Bruderer et al. 2014). The color bar indicates the fluxes in mJy beam-1. The number in the upper right corner of each map is the velocity range of that map. In the H2CO maps, the white contours indicate the 20%, 40%, 60%, 80%, and 100% of the peak intensity of all channels (the peak intensity is 195 mJy beam-1). The dashed ellipse indicates the 60 AU radius ring. The CO +4+6 km s-1 channels are affected by foreground absorption.

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