Table 2: Column densities of H2O, H3O+, and H2 in the Sgr B2 region.
Component N(H2O) N(H3O+) N(H2)a
  1018 cm-2 1015 cm-2 1024 cm-2
Core (M) 35 13.6 4.4
Envelope (OH) 0.15b 3.7 1.1
Beam size ('') 12 18 20
a From CSO 350 $\mu$m data assuming $T_{\rm d}$ = 40 K and $\kappa_\nu$ = 0.07 cm2 g-1 (Lis, priv. comm.).
b From Cernicharo et al. (2006) assuming H2O/H2 = 10-7.

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