Table 1: List of observations using the Plateau de Bure Interferometer. In the column of the configuration, the abbreviation of e.g. ``5D'' refers to the number of antennas and the used configuration.
Line Transition Frequency Configu- Baseline Integration Synthezied beam 1 $\sigma$ rms

[MHz] ration range [m] time ( $T_{\rm ON}$ ) [h] size, position angle [mJy/beam]

HCO⁺ 1-0 89 188.523 5D,C2 24-175 5.9+10 5.2'' $\times$ 4.8'', 6 $^\circ$ 18

HCN J=1-0, F=2-1 88 631.847 6CD 24-175 5.9 6.0'' $\times$ 4.2'', 105 $^\circ$ 24

CS 2-1 97 980.950 5D 24-160 1.8 9.0'' $\times$ 4.2'', 120 $^\circ$ 170

C₂H N = 1-0, J = 3/2-1/2, F = 2-1 87 316.925 6D 24-113 1 9.8'' $\times$ 3.9'', 110 $^\circ$ 37

CH₃OH 15 _(3,13)-14_(4,10) A⁺ 88 594.960 6CD 24-175 3.9 6.1'' $\times$ 4.2'', 105 $^\circ$ 24

CH₃OH 15 _(3,12)-14_(4,11) A^- 88 940.090 5D 24-175 3.9+2.2 6.3'' $\times$ 4.3'', 105 $^\circ$ 24

CH₃OH 2 $_{(1,1)}{-}1_{(1,0)} {\rm A}^-$ 97 582.830 5D 32-73 1.8 9.4'' $\times$ 4.3'', 148 $^\circ$ 170

**Table 1:** List of observations using the Plateau de Bure Interferometer. In the column of the configuration, the abbreviation of e.g. ``5D'' refers to the number of antennas and the used configuration.
Line	Transition	Frequency	Configu-	Baseline	Integration	Synthezied beam	1 $\sigma$ rms
		[MHz]	ration	range [m]	time ( $T_{\rm ON}$ ) [h]	size, position angle	[mJy/beam]
HCO⁺	1-0	89 188.523	5D,C2	24-175	5.9+10	5.2'' $\times$ 4.8'', 6 $^\circ$	18
HCN	J=1-0, F=2-1	88 631.847	6CD	24-175	5.9	6.0'' $\times$ 4.2'', 105 $^\circ$	24
CS	2-1	97 980.950	5D	24-160	1.8	9.0'' $\times$ 4.2'', 120 $^\circ$	170
C₂H	N = 1-0, J = 3/2-1/2, F = 2-1	87 316.925	6D	24-113	1	9.8'' $\times$ 3.9'', 110 $^\circ$	37
CH₃OH	15 _(3,13)-14_(4,10) A⁺	88 594.960	6CD	24-175	3.9	6.1'' $\times$ 4.2'', 105 $^\circ$	24
CH₃OH	15 _(3,12)-14_(4,11) A^-	88 940.090	5D	24-175	3.9+2.2	6.3'' $\times$ 4.3'', 105 $^\circ$	24
CH₃OH	2 $_{(1,1)}{-}1_{(1,0)} {\rm A}^-$	97 582.830	5D	32-73	1.8	9.4'' $\times$ 4.3'', 148 $^\circ$	170

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