H₂O abundance, gas temperature, and H₂O spectrum between 23.7 and 24 μm for a model with a gas temperature increased by a factor of 2 with respect to the fiducial chemistry model. In the first panel, red, pink, and blue contours represent the 70% emitting regions of the H₂O 17_7,10−16_4,13 (E_up = 6371K), 11_3,9−10_0,10 (E_up = 2438K; also shown in black in the second panel), and 8_3,6−7_0,7 (E_up = 1447K) lines, respectively. The dust τ = 1 surface at 15 μm is indicated with a dashed blue line in the first and second panel. In the third panel, the fiducial chemistry (chem.) model is shown in black; the model with increased temperature is shown in red; and the fiducial parameterized model (denoted as PA) is shown in blue.