Water line at 1097.365 GHz observed by the HIFI spectrometer on December 31, 2010. The spectrum is expressed in terms of kelvins on the DSB scale. The asymmetry seen in the line shape is caused by a pointing offset of 1.5′′ in the planet western limb direction. The north-south pointing offset is on the order of a few arcseconds, but cannot be constrained further because of calibration uncertainties. The total uncertainty on the l∕c is 3%.
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