Free Access

Fig. 2


Black: Coadded CO (left) and CH4 (right) line, obtained from coaddition of the observed spectrum within  ± 0.5 nm of (i) the R2–R7 and P1–P3 lines of CO and (ii) the 12 CH4 features identified by dots in Fig. 1. Colored lines: result of the same treatment applied to synthetic spectra. In the right panel, the feature at –0.13 nm is mostly due to the telluric counterpart of the coadded methane line.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.