Correlation between the column densities of OH (this work) and p − H2O (Sonnentrucker et al. 2010), for clouds on the sightlines to W51e2 (black) and W49N (blue). The dashed line shows the linear regression between these quantities. The velocity intervals used to derive the column densities are indicated. N(H2O) values are from Sonnentrucker et al. (2010) and Sonnentrucker et al. (2015).
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