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Evaluation of gas-phase chemistry with the ADJ (adjoint) against the FDM (finite-difference method) sensitivities of the final O3 concentrations (ppmV) with respect to the initial NO2 concentrations (ppmV) from a 1d test run. The perturbation sizes are 0.1, 0.01, and 0.001ppb for the FDM in the plots from the top to the bottom.
