Fig. A.4

(CH3)2CO spectra near 225 and 229 GHz toward four positions (three acetone emission peaks and HC) in the Orion BN/KL region. Dashed lines indicate the VLSR of 8 km s-1 and correspond to the (CH3)2CO line shown at the top of each panel. c) The dotted line indicates the (CH3)2CO 221,21 − 212,20 AE/EA and 222,21 − 211,20 AE/EA lines at 229 033.8 MHz. d) The dotted line indicates the (CH3)2CO 149,6 − 138,5 EE line at 229 058.0 MHz.
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