Another useful tool in understanding reacting-flow calculations is rate-of-production analysis. Rate-of-production analysis determines the contribution of each reaction to the net production or destruction rates of a species. Rate-of-production analysis is particularly useful for 0-D and plug-flow systems, where the computational expense for the added calculations is small and it is possible to consider data from a large reaction set. For this reason, rate-of-production tables are printed to the diagnostic output file for these types of models (based on user requests), to allow quick identification of dominant reaction paths. For all other reactor models in Ansys Chemkin, rate of production data can be obtained through the Graphical Post-Processor. This data option can be selected at the time that the solution file data is being imported into the Post-Processor.