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SLIMCAT modelled background zonal mean N2O (ppbv) at an altitude of 32 km as a function of meteorological year (A) and zonal mean NOy differences (ppbv) (B) at an altitude of 32 km. Differences are calculated between the integration with both subsonic and supersonic aircraft and the integration with only subsonic aircraft, as a function of meteorological year (adapted from Rogers et al., 2000).
