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Table 1

Physical parameters of C4H, c-C3H2 and H13CO+ lines.

Molecular Transition Q37.50 freq Eup gu A
(MHz) (K) (10−5 s−1)
C4H N=9–8 J=19/2–17/2 660.0312 85634.0044 20.561 19 1.5175
N=9–8 J=19/2–19/2 660.0312 85634.0154 20.561 21 1.5267
N=9–8 J=17/2–15/2 660.0312 85672.5793 20.563 17 1.5078
N=9–8 J=17/2–17/2 660.0312 85672.5815 20.563 19 1.5193
c-C3H2 J=2(1,2)−1(0,1) 566.8560 85338.8940 6.445 15 2.3221
H13CO+ J=1–0 18.3516 86754.2884 4.164 3 3.8535

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