Herschel-HIFI observation of the CO(8−7) line in Uranus on June 15, 2012, expressed in terms of line-to-continuum ratio (l/c, black line). This line can be modeled successfully with either empirical models: (i) a “uniform” profile with a constant mole fraction of 7.2 × 10^-9 throughout the atmosphere (red line); and (ii) a “stratospheric” profile with a constant mole fraction of 7.1 × 10^-9 above the 100 mbar level and zero below it (blue line). The spectrum resulting from the Encrenaz et al. (2004) uniform source profile is also shown for comparison (grey line, labeled “E04”). The synthetic lines are obtained with the thermal profile of Feuchtgruber et al. (2013).