Table 1: Observed molecules together with the observing parameters. The critical densities ( $n_{\rm cr}$ ) are computed for temperatures between 50 and 100 K using the collisional coefficients quoted in Sect. 4. The area mapped ( $\Delta \alpha \times \Delta \delta$ ) in each transition and the sampling of the map are reported in the last two lines. $B_{\rm eff}$ is the beam efficiency of the telescope. The symbol "-'' implies that only observations towards the "key'' positions have been obtained.
Transitions SO $3_2\rightarrow 2_1$ SO $6_5 \rightarrow 5_4$ ³⁴SO $3_2\rightarrow 2_1$ SO₂ $5_{1,5}\rightarrow 4_{0,4}$ H₂S $2_{2,0}\rightarrow 2_{1,1}$ H₂S $1_{1,0} \rightarrow 1_{0,1}$

$\nu$ (GHz) 99.299 219.949 97.715 135.696 216.710 168.762

$E_{\rm up}$ /k (K) 9 35 9 15.6 84 24

$n_{\rm cr}$ (cm^-3) 10⁵ 10⁶ 10⁵ $2 \times 10^{6}$ 10⁶ $2 \times 10^{6}$

Telescope SEST SEST IRAM IRAM IRAM SEST IRAM IRAM

$T_{\rm sys}$ (K) 160 250 140 400 270 220 600 700

Beam ('') 51 24 26 18 18 25 11 14.5

$B_{\rm eff}$ 0.75 0.5 0.75 0.59 0.71 0.5 0.57 0.65

$\Delta \nu$ (kHz) 86 86 40 39 39 86 42 42

$\Delta \alpha \times \Delta \delta$ ( $\hbox{$^{\prime\prime}$ }\times \hbox{$^{\prime\prime}$ }$ ) $280 \times 190$ $288 \times 216$ - $120\times100$ - $120\times100$ - -

sampling ('') 24 24 - 12 - 24 - -

**Table 1:** Observed molecules together with the observing parameters. The critical densities ( $n_{\rm cr}$ ) are computed for temperatures between 50 and 100 K using the collisional coefficients quoted in Sect. 4. The area mapped ( $\Delta \alpha \times \Delta \delta$ ) in each transition and the sampling of the map are reported in the last two lines. $B_{\rm eff}$ is the beam efficiency of the telescope. The symbol "-'' implies that only observations towards the "key'' positions have been obtained.
Transitions	SO $3_2\rightarrow 2_1$	SO $6_5 \rightarrow 5_4$	³⁴SO $3_2\rightarrow 2_1$	SO₂ $5_{1,5}\rightarrow 4_{0,4}$	H₂S $2_{2,0}\rightarrow 2_{1,1}$	H₂S $1_{1,0} \rightarrow 1_{0,1}$
$\nu$ (GHz)	99.299	219.949	97.715	135.696		216.710		168.762
$E_{\rm up}$ /k (K)	9	35	9	15.6		84		24
$n_{\rm cr}$ (cm^-3)	10⁵	10⁶	10⁵	$2 \times 10^{6}$		10⁶		$2 \times 10^{6}$
Telescope	SEST	SEST	IRAM	IRAM	IRAM	SEST	IRAM	IRAM
$T_{\rm sys}$ (K)	160	250	140	400	270	220	600	700
Beam ('')	51	24	26	18	18	25	11	14.5
$B_{\rm eff}$	0.75	0.5	0.75	0.59	0.71	0.5	0.57	0.65
$\Delta \nu$ (kHz)	86	86	40	39	39	86	42	42
$\Delta \alpha \times \Delta \delta$ ( $\hbox{$^{\prime\prime}$ }\times \hbox{$^{\prime\prime}$ }$ )	$280 \times 190$	$288 \times 216$	-	$120\times100$	-	$120\times100$	-	-
sampling ('')	24	24	-	12	-	24	-	-

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