Spatially integrated spectrum of the 448 GHz H₂O line of G09v1.97 (yellow histograms). B and R correspond to the blue- and redshifted components of G09v1.97. The overlaid blue line shows the observed H₂O(2₁₁ − 2₀₂) line (Y19) after scaling its flux density down by a factor of 25. The dashed red lines show Gaussian fitting to the emission lines. Close to the 448 GHz H₂O line, we also tentatively detect a 2.3σ emission line (at the velocity of the R component) at ∼449 GHz, which may be either C¹⁷O(4–3) or c-C₃H₂(7₆₂ − 6₅₁). If the emission is indeed C¹⁷O(4–3), the integrated flux density ratio of C¹⁶O(4–3)/C¹⁷O(4–3) would be ∼110, which will be discussed in Yang et al. (in prep.). The dust continuum at rest frame 615 μm is also detected with a flux density of 1.13 ± 0.04 mJy.