Table 2: Column densities.
Source N(HOC+) N(HCO+) N(OH)
  $10^{10}~{\rm cm}^{-2}$ $10^{12}~{\rm cm}^{-2}$ $10^{13}~{\rm cm}^{-2}$
B0355+508 9.01(1.07) 6.51(0.02) 14.87(0.67)
B0415+379 10.9(0.90) 12.8(0.40)2 42.50(0.10)
B0528+134 <7.71 2.28(0.02) 4.72(0.31)
B1730-130 < 5.71 1.25(0.02) 1.34(0.08)
B2200+420 3.7(1.3) 2.58(0.03) 5.73(0.21)
1 Limits are $2\sigma$.
2 Entry is $59\pm 2$ N(H13CO+).

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