A hexagon in Saturn's northern stratosphere surrounding the emerging summertime polar vortex.

There may be a weak trend with the longevity of the photochemical species 18 , with longer-lived ethane and propane showing the most similarity between the poles (ratios of 0.7–1.0) and the shorter-lived acetylene, diacetylene and methyl acetylene showing greater contrasts (0.2–0.6).

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