Table 2: Observational data.
  Redshifted   Time  
Line frequency Date ON Array$^\diamond$
  (MHz)   source  

HCO+ ( $2\leftarrow 1$)		 94587.58 1999/06/11 3.0 h 4C1
    2001/03/20 2.5 h 4ANT
    2001/06/29 3.5 h 4ANT
    2002/06/25 3.0 h 5D
    2003/02/26 2.2 h 6Ap
    2003/03/01 2.6 h 6Ap

H13CO+ ( $2\leftarrow 1$)		 92006.01 1999/06/13 2.9 h 4C1
    2002/06/21 2.7 h 5D
    2002/06/23 3.7 h 5D
    2002/07/15 1.3 h 5D

HC18O+ ( $2\leftarrow 1$)		 90317.61 1999/08/03 3.2 h 4ANT
    1999/09/09 2.8 h 4C2
    1999/10/02 2.8 h 4C2
    1999/11/12 1.8 h 5D
    2001/05/08 1.7 h 4ANT

HC17O+ ( $2\leftarrow 1$)		 92327.67 1999/07/08 4.3 h 4D2
    1999/07/15 3.7 h 4D2
    1999/07/25 3.0 h 4D2
    1999/09/24 2.0 h 4C2
    1999/10/14 2.3 h 4B1
    1999/10/26 2.0 h 4B1
    1999/10/29 3.2 h 4D1
    1999/11/01 3.2 h 4D1
    1999/11/08 1.7 h 5D

HCN ( $2\leftarrow 1$)		 93996.83 1999/08/04 2.0 h 4ANT
    2003/08/03 1.3 h 30M

H13CN ( $2\leftarrow 1$)		 91566.38 1999/08/29 2.7 h 5D
    2001/07/03 2.6 h 5D

HC15N ( $2\leftarrow 1$)		 91264.34 1999/08/25 4.2 h 4D1
    1999/10/04 1.6 h 4C2
    2001/05/28 2.0 h 4ANT
    2001/05/30 1.5 h 4ANT
    2001/08/13 3.3 h 4D1
    2001/08/14 2.8 h 4D1
    2001/08/15 3.7 h 4D1

HNC ( $2\leftarrow 1$)		 96151.68 2002/08/07 3.7 h 5D

HN13C ( $2\leftarrow 1$)		 92362.69 2001/08/26 2.7 h 4D1
    2001/10/15 1.2 h 4ANT

H15NC ( $2\leftarrow 1$)		 94244.99 2001/08/04 2.8 h 4D1
    2001/08/07 3.3 h 4D1
    2001/08/25 2.7 h 4D1

DNC ( $2\leftarrow 1$)		 80924.89 2001/08/28 2.7 h 4D1

CS ( $4\leftarrow 3$)		 103909.33 1999/07/09 3.3 h 4D2

C34S ( $4\leftarrow 3$)		 102246.49 1999/09/21 1.8 h 4C2
    1999/09/23 2.2 h 4C2
    2001/05/09 1.8 h 3ANT
    2001/05/10 3.4 h 5D
    2001/05/14 2.6 h 5D

H2S ( $1_{10} \leftarrow 1_{01}$)$^\dagger$		 89490.39 2005/07/05 4.3 h 5D
    2005/07/29 3.2 h 5D
    2005/09/05 3.0 h 5D
    2005/09/09 1.8 h 5D
$^\diamond$ The number of antennae is given with the name of the array configuration if defined.
$^\dagger$ The H234S (1 $_{10} \leftarrow 1_{01}$) (89038.47 MHz) and H233S (1 10-101) (89256.88 MHz) were observed simultaneously in the same correlator setup.

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