OH 119 μm spectrum of ULAS J131911+095051 (black and yellow). The shaded gray rectangles show the ±1σ uncertainty on the continuum. The systemic velocity is set by the observed redshift of the source based on a secure detection of the [C II] line (Wang et al. 2013). The vertical dashed lines show the expected position for the OH 119 μm doublet. The green line shows the best single-component Gaussian fit to the data. For comparison, we include the Herschel/PACS OH 119 μm spectrum of local ULIRG Mrk 273 (red) smoothed in velocity to match the resolution of the ALMA OH spectrum.