Table 4: Column densities and relative abundances.

Species		 B2200 B0355 B0415 TMC-16
  $10^{12} ~{\rm cm}^{-2}$ $10^{12} ~{\rm cm}^{-2}$ $10^{12} ~{\rm cm}^{-2}$ $10^{13}~{\rm cm}^{-2}$

OH7		 68 34 360 300
CO8 $1.9\times10^4$ $0.5\times10^4$ 5- $8\times10^4$ $8\times10^4$
HCO+1 2.0 1.2 11.6 8
C2H2 31 23 75 50-100
C3H22 5.0 3.7 13.3 10
H2CO3 6.2 6.9 20.5 20
CS4 2.7 4.3 10.1 10
HCS+4     0.76 0.6
SO4 3.43 1.66 13.0 5
H2S4 0.52 0.76 1.66 <0.5
NH3 3   2.5 12.2 20
CN5 32.9 41 158 30
HCN5 4.5 3.6 24.8 20
HNC5 0.74 1.1 5.54 20
HC5N5 <0.20 <0.25 <0.32 3
CH3OH <0.52 <0.43 <1.3 2
1 Lucas & Liszt (1996); 2 Lucas & Liszt (2000); 3 Liszt et al. (2006); 4 Lucas & Liszt (2002); 5 Liszt & Lucas (2001); 6 Ohishi et al. (1992); 7 Liszt & Lucas (2000); 8 Liszt & Lucas (1998).

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