Fig. 1.
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Energy level diagram of H2O. Downward solid red and gray arrows are the transitions reported in this paper and those available in the literature (see Yang et al. 2019a, Li et al. 2020b, Riechers et al., in prep.). The upward dashed orange arrows indicate the FIR H2O pumping (absorption) lines of interest. The respective wavelengths are also reported.
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