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Fig. 1.

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Observed lines of CH2DC4H in TMC-1 in the 31.0–50.4 GHz range. Frequencies and line parameters are given in Table 2. Quantum numbers for the observed transitions are indicated in each panel. The red line shows the synthetic spectrum computed for a rotational temperature of 8 K and a column density of (5.5 ± 0.2) × 1011 cm−2 (see text); also, the dashed blue line indicates the 3σ noise level. Blank channels correspond to negative features created during the folding of the frequency switching data. The asterisk indicates Ka = 2 transitions and the label U corresponds to features above 4σ.

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