Optically thin estimates of HnO+ column densities toward the CO+ peak of the Orion Bar, in units of 1012 cm-2, as a function of assumed excitation temperature.
|10||82.1||< 2.85||< 7.21|
|20||8.61||< 0.21||< 0.64|
|40||4.01||< 0.10||< 0.27|
|80||3.90||< 0.13||< 0.32|
|160||5.45||< 0.25||< 0.64|
Notes. The limits for H2O+ and H3O+ are based on the 607 and 985 GHz lines; limits from the other lines are significantly higher.
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