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TL2CH4N_8 is the Tropospheric Emission Spectrometer (TES)/Aura Level 2 Methane Nadir Version 8 data product from NASA. It contains retrieved vertical profiles of methane concentration and estimated errors from nadir-pointing satellite observations, along with geolocation, quality flags, and surface characteristics. The data are derived from a retrieval process comparing observed infrared spectra to radiative transfer models.
License is listed as 'other-license-specified' but details are not provided. Data files are split across four files per orbit, corresponding to four instrument focal planes.