Table 5: Fit of the NE opacity profiles.

Line		 V0 $\tau$ $\Delta V_{1/2}$ $\int \tau{\rm d}V$
  (km s-1)   (km s-1) (km s-1)
HCO+ (1-2) -147.2 0.35 14.7 5.5 (0.05)
HCN (1-2) -146.4 0.28 11.6 3.5 (0.2)
HNC (1-2) -146.0 0.07 14.1 1.1 (0.05)
CS (3-4) -146.4 $^\dagger$ 0.02 11.6 $^\dagger$ 0.28 (0.08)
H13CO+ (1-2) - (0.007) 14.7 $^\dagger$ $\leq$0.12

$^\dagger$ Fixed parameter.

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