Determination of rate parameters based on NH2 concentration profiles measured in ammonia-doped methane–air flames

•NH2 concentration profiles in NH3-doped laminar flat methane flames were evaluated.•Arrhenius parameters of reactions NH2 + H = NH + H2 and NH3 + OH = NH2 + H2O were fitted.•Direct measurements and theoretical determinations were also used as targets.•The obtained mechanism gives better description of the experimental data.•Temperature-dependent uncertainty bands of the rate coefficients were determined.