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The derived HCO+ column densities span a broad range, $10^{11}< N(HCO+)/\\Delta v <4 \\times 10^{12} \\rm cm^2/(km/s^{-1}$, and the inferred HCO+ abundances, $2 \\times 10^{-10}<X(HCO+) < 10^{-8}$, are more than one order of magnitude above those produced by steady-state chemistry in gas weakly shielded from UV photons, even at large densities. 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