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Fig. 2.


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Observed lines of t-CH3CHCHCN (trans-crotononitrile) towards TMC-1. Line parameters are given in Table A.2. The abscissa corresponds to the rest frequency assuming a local standard of rest velocity of 5.83 km s−1. The ordinate is the antenna temperature corrected for atmospheric and telescope losses in milli Kelvin. The red line shows the synthetic spectrum derived for Trot = 7 K and N(t-CH3CHCHCN) = 5.0 × 1010 cm−2. Blank channels correspond to negative features produced in the folding of the frequency switching data. The hyperfine structure has been included in the model.

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