These are the support files for RES2DINV produced by the
JACOBWIN program. If you want to save a few minutes in calculating
these support files, then just copy them directly to the subdirectory
where RES2DINV was installed; for eg. C:\RES2DINV

These files support up to 500 electrodes. If you plan to use more
electrodes in your surveys, run the JACOBWIN program and select the
appropriate number of electrodes; for. eg. 2000.