Correlation between the O i column density and the total (atomic and molecular) hydrogen column density derived from HF and H i for sightlines toward W31C, G34.26, and W49N and in 1 km s-1 wide velocity bins. Colors indicate the velocity intervals defined in the legend. Only data points with N/σN> 5 both in O i and 2N(H2) + N(H i ) are shown. The regression lines are shown in red. The corresponding correlation coefficients ρ are given in the lower right corners. For details see text.
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