Variation of the saturation methane mixing ratio with pressure computed from the temperature profiles derived from Voyager-2 data. The blue and red dots indicate the pressures where the saturation curves intersect the assumed deep methane abundances (pressures indicated in red and blue on the left and right sides of the figure). The black solid and dotted lines represent the saturation mixing ratio when a ∆T of ±4 K is added to Uranus’ temperature profile.