 Its high redshift shifts the far-infrared spectrum into millimeter wavelengths where it can be observed from observatories on the ground.In 2008 and 2009 the intensities of its water vapor spectral lines were measured using the millimeter wave spectrometer Z-Spec at the Caltech Submillimeter Observatory.Comparing the spectrum to that of Markarian 231, another ULIRG, showed that it had 50 times the water vapor of that galaxy.