The calculations presented here used different rates for 19 reactions than in the default data (the ReaclibV2.0 snapshot available from the Joint Institute for Nuclear Astrophysics database at https://groups.nscl.msu.edu/jina/reaclib/db/). The “updated” rates for these 19 reactions are computed either from rate formulae or rate fits. This section describes how to change or add user-defined rate expressions for simple_snII.