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Fig. 2


Spectrum of H2CO 9(1, 8)8(1, 7) toward IRS 48 spatially integrated over the rectangle [1.0′′ to +1.0′′, 0.3′′ to +0.2′′]. The dotted line indicates the zero-emission line and the dashed line the source velocity of 4.55 km s-1.

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