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Table 6

ΔRw values needed to have NH,meas = NH,pred with the assumption of all obscuration due to a warp of the maser disk entering the line of sight.

Name Rw [pc] ΔRw [pc]

NGC 1194 1.29 0.04
NGC 1386 0.84 0.09
NGC 2273 <0.13 >0.07
NGC 2960 0.36 0.01
NGC 3079 1.23 0.07
NGC 3393 1.44 0.06
NGC 4388 0.283 0.007
IC 2560 <0.25 >0.08
NGC 1068 <1.0 >0.1
NGC 4945 0.35 0.06
Circinus 0.3 0.1
NGC 4258 0.277 0.003
NGC 6264 <0.77 >0.03
UGC 3789 <0.28 >0.02

Notes. Uncertainties are neglected for clarity. Warp depths are lower than, or comparable to, the uncertainties on outer maser radii. The five sources with a lower limit on the column density consequently have a lower limit on the warp depth.

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