H2CO 303–202 residual (data-model) channel maps, Hanning smoothed to 0.336 km s-1 channels. Black contours mark 1.5 × 10-3 (1σ) × [ 3,6,9 ] Jy beam-1. Dashed contours are negative at the same intervals. Synthesized beam and AU scale are shown in the lower left panel.
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