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Fig. D.1.
Same as Fig. 2 but for the observed transitions of HCOCCH towards TMC-1. The red line shows the computed synthetic spectrum for propynal assuming Tr = 5 K for the Ka = 0 lines and Tr = 4 K for the Ka = 1 lines. The resulting column density is N(HCOCCH) = 1.5 × 1012 cm−2.
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