Table 3: Column density ratios1.
Source N(HCO+)/N(HOC+) N(HOC+)/N(OH)
B0355+508 72(9) $6.1(0.7)\times10^{-4}$
B0415+379 117(12) $2.6(0.3)\times10^{-4}$
B0528+134 >30 ${<}1.6\times10^{-3}$
B1730-130 >18 ${<}4.3\times10^{-3}$
B2200+420 70(24) $6.5(2.1)\times10^{-4}$

1 Limits are $2\sigma$.

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