) is the median of the sensitivities for the species of interest n between all the 154 experiments when the rates of reactions are multiplied or divided by 10, respectively. The division by the median is to account for the difference of variability for each species of interest. The natural stochasticity of the KMC method induces an intrinsic variability for each species of interest and this variability can be different between each species. To account for that, the division by the median acts as a normalizer: as most of the reactions have a small or negligible effect on each species of interest, the median of the sensitivity for a specific species of interest between all the 154 experiments represents the case where no change was observed for the species of interest. With this normalization, a modification of a reaction rate coefficient that has no influence on a specific species have a sensitivity value of 1 for this specific species (see Supplemental Materials Fig. ). Adding for all the six species of interest and for the two possibilities (multiplying or dividing by 10) gives the overall "sensitivity score" and this score has a value around 12 if the system has little sensitivity to this reaction.