Comparison between the spatial coverage of the SOFIA/EXES observations and spatial distribution of CH4 detections reported by Mumma et al. (2009). The colored cross is the location where each pixel of the EXES detector was positioned during observation, and the distorted circles represent the field of views (FOVs), which size is 3 arcsec, for each pixel. Each color represents a set of 15 pixels which we averaged in our analysis (see Fig. 2). The filled rectangles shows the regions where Mumma et al. (2009) reported detections of CH4 (red: 25–40 ppb, green: 10–25 ppb, blue: 0–10 ppb) at the northern summer (Ls = 121–155∘) in MY26. See the main text for the small panel embedded at the lower left corner.
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