Mixing ratio profiles for key hydrocarbons (as labeled) on Uranus as a function of season for 3°N planetocentric latitude (Top), 45° planetocentric latitude (Middle), and 81° planetocentric latitude (Bottom). Seasons are shown every 30° in Ls. Data points are from various published observations (Encrenaz et al., 1986, 1998; Orton et al., 1987; Herbert et al., 1987; Caldwell et al., 1988; Yelle et al., 1989; Bishop et al., 1990; Bézard et al., 1999; Orton et al., 2014c).