*INDEX-OUT
Indicates the index-results-file (irf) to which the simulation results ASCII data is written.
When the restart run is started,
some information is copied from the SR2 input files to the SR2 output files.
Time-based histories are not copied but are accessed by parts from each set of SR2 files that lead up to the current run;
do not delete the input SR2 files until the information they contain is no longer needed.