Fig. 3.
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Observed rotational transitions of H2CCCN in TMC-1 in the 31.0–50.4 GHz range. The abscissa corresponds to the rest frequency, assuming a local standard of rest velocity of 5.83 km s−1. The ordinate is antenna temperature in millikelvins. Curves shown in red are the computed synthetic spectra for Trot = 6 K, N(ortho-H2CCCN) = 1.4×1011 cm−2, and N(para-H2CCCN) = 1.1×1011 cm−2.
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