Integrated intensity map of the H2CO 9(1, 8)–8(1, 7) emission. The color bar gives the flux scale in mJy beam-1 km s-1. The white contours indicate the 690 GHz continuum at 3, 30, and 300σ from the thermal emission of the millimeter-sized dust grains. The position of the star IRS 48 is indicated by the star and the 60 AU radius (the dust trap radius) by a white dashed ellipse.
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