Fig. 4
Panel A: retrieved CH4 VMR values plotted against their corresponding 1σ uncertainty, with colours referring to the density of points (redder equals denser), and the horizon corresponding to 0.3, 0.5, and 1σ represented by the blue, red, and black dashed lines. Panel B: nσ distribution of the retrievals, with n- representing the ratio of the retrieved value over its corresponding 1σ error. Panel C: distribution of the upper limit verification index, which is equal to the ratio of the CH4 LOS density value retrieved after injecting an amount equivalent to the CH4 2σ error into the spectrum.
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