Table 1: Observational parameters and Gaussian line fits.
Line $\nu$a [GHz] HPBWb [''] $\eta_{\rm mb}$c I $^{d}=\int T_{\rm A}^* {\rm d}V$ [K ${\rm km~s}^{-1}$] $V_{\rm c}$e [ ${\rm km~s}^{-1}$] $\Delta V$f [ ${\rm km~s}^{-1}$] $T_{\rm A}^*$h [mK]
CO 1-0 115.271 21 0.74 $14.6 \pm 0.7$ 2110 120 114.0
CO 2-1 230.538 10 0.53 $20.2 \pm 0.9$ 2114 107 157.0
CN 1-0 113.491 22 0.74 $1.50 \pm 0.25$ 2081 154 8.5
CN 2-1i 226.875 11 0.53 $2.46 \pm 0.2^{j}$ 2115 150 7.8
CN 2-1k 226.659 11 0.53 ... ... 215 5.5
HCO+ 1-0 89.188 28 0.77 $1.74 \pm 0.12$ 2110 150 9.9
HCO+ 3-2 267.558 9.2 0.45 $4.1 \pm 0.6$ 2120 190 21.5
HCN 3-2 265.886 9.4 0.46 $2.4 \pm 0.3$ 2110 240 9.3
HNC 1-0 90.664 27 0.77 $1.24 \pm 0.12$ 2120 156 7.5
HNC 3-2 271.981 9 0.44 $4.97 \pm 0.6$ 2120 150 29.3
HC3N 10-9 90.979 27 0.77 $0.8 \pm 0.08$ 2110 122 6.4
HC3N 16-15l 145.561 17 0.70 $1.7 \pm 0.08$ 2120 130 8.6
HC3N 25-24 227.419 11 0.53 $1.6 \pm 0.2$ 2130 140 10.0
HNCO 4-3 87.925 28 0.77 <0.36 (3$\sigma$) ... ... ...
H2CO 2-1 140.839 17 0.70 $1.05 \pm 0.2$ 2156 145 5.7
H2CO 3-2 225.698 11 0.53 $0.6 \pm 0.3$ 2140 145 3.6
OCS 12-11 145.947 17 0.70 $0.8 \pm 0.14$ ... 174 4.8
a Rest frequency. b Beam width. c Main beam efficiency. d Integrated intensity. in $T_{\rm A}^*$, uncorrected for beam efficiency and beam size. e Centre velocity of the line. f Line width from Gaussian fit. h Peak intensity from Gaussian fit. i First spingroup. j Including both first and second spingroup. k Second spingroup. l HC3N 16-15 is contaminated by para-H2CO. Its contribution is estimated to 20%. Fitted Gaussians and integrated intensities are only for the HC3N component (see text).

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