Table 1: Summary of spectroscopic observationsa.
Molecule Line Frequency Telescope Date Channel FWHM Position rms
    Rest Redshifted   of width beam angle  
          observation   size    
    (GHz)     (km s-1) (arcsec) (degrees) (mJy)
H2CO(O) 110-111 4.830 2.867 Effelsberg 05-Sep.-97 1.6 250 - 1
H2CO(O) 211-212 14.488 8.600 VLA-A 24-Aug.-95 1.7 0.26 $\times$ 0.24 27 2
H2CO(P) 101-000 72.838 43.236 VLA-A 02-Dec.-96 3.1 0.05 $\times$ 0.04 16 10
H2CO(O) 212-111 140.840 83.601 PdBI-5C2 09-Nov.-96 0.25 6.03 $\times$ 5.29 11 36
H2CO(P) 202-101 145.603 86.429 PdBI-5C2 23-Mar.-97 0.25 5.83 $\times$ 5.06 15 31
H2CO(O) 211-110 150.498 89.335 PdBI-5C2 05-Aug.-97 0.25 5.64 $\times$ 4.39 14 35
a Column 1: H2CO species (O: ortho; P: para). Column 2: quantum numbers of the respective transition ( $J_{\rm KaKc}$). Columns 3 and 4: rest and redshifted frequencies. Columns 5-7: observatory (VLA: Very Large Array; PdBI: Plateau de Bure Interferometer), epoch and channel width. Columns 8 and 9: Full Width to Half Power (FWHP) beam size and major axis beam orientation. Column 10: 1$\sigma$ noise level.

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