The program can be executed as follows after setting a path to the bin directory of this software package:

mpirun -np N_proc rf_inv (input parameter file).

• N_proc is a number of processes used in a parallel computation.
• Each process carries out N_chains MCMC sampling.
• The first argument is a name for parameter file (see Input files).
• If the parameter file name is not given, the program seek a file named params.in in the current directory.