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Fig. 6
APEX spectra for H2CO 303–202 (black) and H2CO 322–221 (blue), the latter line is scaled with different factors (4.0, 4.7, and 5.1 from top to bottom) to make the Gaussian tails fit. The vertical shifts between the spectra are 5 K. The H2CO 321–220 (not displayed) has a shape similar to the H2CO 322–221 line.
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