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Fig. A.1

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Blueshifted channel maps of the H2CO molecular line emission of the GGD 27–MM2(E) protostellar system. The channel velocity in km s−1 is indicated in the top-left corner. The contours start at 3σ and are in steps of 3σ, 6σ, 9σ, and 12σ, where σ = 2.1 mJy beam−1. The cyan dot and square mark the position of the CH3OH and H2O maser sources obtained from Kurtz et al. (2004) and Kurtz & Hofner (2005), respectively. The green star marks the position of the source MC taken from Qiu & Zhang (2009). The synthesized beam in all panels is shown in the lower-left corner. The two red arrows present the redshifted NE and NW CO outflow directions, and the blue arrow is the blueshifted SE CO outflow direction taken from Fernández-López et al. (2013).

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