Spectra showing the water absorption lines observed toward BN. Fits to the components at 8, 0.5, and −17 km s⁻¹, are shown by blue, cyan, and green curves, respectively, and the sum of all components is shown as a red dashed curve. The top spectrum shows a non-detection of the transition predicted to have the strongest absorption after the detected transitions in the observed wavelength range (ν₂ 3_1,2–2_2,1 at 6.1068262 μm). Spectra have been shifted vertically for clarity.