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Mixing ratios of ethane and acetylene (Left) and methylacetylene and diacetylene (Right) at 0.1 mbar (Top) and 1 mbar (bottom) on Neptune for four different seasons: Ls = 0° (dotted orange), 90° (solid blue), 180° (dashed green), and 270° (solid red). (For interpretation of the references to color in this figure legend, the reader is referred to the online version of this article.)
