Input file: d.in contains program input parameters in the DMPPAR namelist Input file: i.out is the output file generated by RAYINVR Input/Output file: v.in is the input file used by RAYINVR if imodf=1; it is overwritten with the updated velocity model after applying the inversion Output file: d.out contains the model parameter adjustments and corresponding resolution and error estimates as well as the updated velocity model