Fig. 8
Annual evolution of the best 1σ upper limits (clipped at 100 pptv) derived at each occultation and plotted as a function of Solar longitude (Ls). Upper limit symbols (downward arrows) are coloured depending on their latitude. The values reported by MSL in Webster et al. (2018) concerning the background detections of methane are shown as filled stars (MY32), circles (MY33), and squares (MY34) with their associated error bars.
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