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Table 1

Main observational parameters.

Parameter IRAM PdBI IRAM 30 m
SiO (21) HCN (10) SiO (21) HCN (10)

Frequency (GHz) 86.846 88.631 86.846 88.631
Bandwidth (MHz) 40 80
Spec. Res. (km s-1) 0.27 1.06 0.67 0.67
Primary beam 59′′ 59′′ 29.9′′ 29.9′′
Synthesized beam
1σ rms 0.20 Jy/Beam km s-1 0.49 Jy/Beam km s-1 0.02 K km s-1 0.04 K km s-1
System temperature (K) 120 120

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