High resolution vertical profile of methane below 30 km. Black dots represent the median of 100 000 deconvolutions and grey bars their 1 − σ deviations. As the main source of uncertainties comes from the seeding fractionation pattern and not the retrieval method, error bars should be understood as systematic errors. This means that for example if a more accurate measurement was to confirm a given value to be lower than the mean reported value here, this would be valid for all the other altitudes as well. Blue diamonds and bars represent methane mixing ratios reported by Niemann et al. (2010) and their standard deviation, respectively.