Table 3: Results of our fit of the CH lines towards Sgr B2 are given in column (A). The velocities and line widths are taken from the H I data of Garwood & Dickey (1989). Column (B) gives the previous estimates of CH column densities from the KAO measurements of Stacey et al. (1987) and columns (C) and (D) give the results from the radio $\Lambda $-doublet lines from Genzel et al. (1979) and Andrew et al. (1978).
LSR Velocity FWHM $N({\rm CH})$ (1014 cm-2)
(km s-1) (km s-1) (A) (B) (C) (D)
-107.6 7 $0.9\pm0.7$ 4.2    
-81.7 28 $2.6\pm1.1$     2.5
-51.9 17 $0.3\pm0.1$5      
-44.0 8 $1.5\pm0.6$ 3.6   1.3
-24.4 14 $1.9\pm0.4$     0.3
+1.1a 19 $2.0\pm0.3$ 3.2   1.1
+15.7 7 $3.1\pm0.8$     1.5
+31.4 21 $1.5\pm1.0$      
+52.8/+66.7b 11/16 $9.3\pm0.9$ 5.2 3.1 9.4c
Total   20.1 15.2   16.1
a This velocity is corrected from an error in Garwood & Dickey (1989) where it is given as +11 km s-1.
b The H I data resolve 2 components in Sgr B2. However, our fit requires only one of these (at 66.7 km s-1) to reproduce the ISO spectrum.
c This is the combined value for all components >50 km s-1 assuming the emission fills the beam, as described in the text by Andrew et al. (1978).

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