Fig. 4.
Selected lines of HC4N in the 31−50 GHz frequency range toward TMC-1. The abscissa corresponds to the rest frequency assuming a vLSR for TMC-1 of 5.83 km s−1. The ordinate is the antenna temperature, corrected for atmospheric and telescope losses, in mK. The violet line shows the synthetic spectrum computed for Tr = 4.0 K and N(HC4N) = 3.7 × 1011 cm−2.
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