Table 2: Column densities of selected molecules in IRC +10216.
Molecule $T_{\rm rot}$ (K) $N_{\rm tot}$ (cm-2)
    observedcalculated
     This work [1]
HC3N 15 2.2(15) $^\textnormal{\scriptsize {[2]}}$2.8(15) 3.6(15)
CH2CHCN 46 5.5(12)1.4(13) 2.2(11)
CH2CN 50 8.6(12)4.6(12) 1.4(13)
CH3CN 40 3.0(13) $^\textnormal{\scriptsize {[2]}}$6.3(12) 6.8(12)
CH3C3N 30a <1.3(12) $^\textnormal{\scriptsize {[2]}}$1.2(11) 1.4(12)
CH3CCH 30a 1.8(13)1.1(12) 8.0(12)
CH3C4H 30a <9.7(12) $^\textnormal{\scriptsize {[2]}}$8.2(12) 9.0(12)
H2CO 28 5.4(12) $^\textnormal{\scriptsize {[3]}}$2.8(12) -
H2CS 30a 1.0(13)1.3(12) 4.4(11)
Note. a(b) refers to a $\times $ 10b. A superscript ``a'' indicates an assumed rotational temperature.
References. [1]: Millar et al. (2000); [2]: from unpublished IRAM 30-m data; [3]: from the observations by Ford et al. (2004).

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