Correlation between FCO measured from the CO 6−5 (left) and CO 3−2 (right) data and the integrated intensity of the ground-state H2O 110–101 transition at 557 GHz. The integrated intensities are scaled to a common distance of 200 pc (Kristensen et al. 2012). The correlation is strong for CO 6−5, r = 0.90 with 4.1σ. The green lines shows the best-fit power-laws to the data and are simple least-squares fits.
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