Fig. 8

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Flux density of the envelope emission in ALMA B7 (orange) is consistently lower by at least an order of magnitude than a black body spectrum of emitting dust with a radial temperature profile T ∝ r−0.4 (green). The optical depth (violet) is much smaller than 1 at all envelope scales, thus we can consider the envelope emission at 0.88 mm as optically thin.
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