Back tracking if the line search produces estimate with larger cost. Factor for shortening step size. Maximum number of iterations before searching in opposite direction. Maximum number of inner iterations. Maximum size of relative step. Configure cost function to minimize For preparing restart files: specify the prefix of the restart file names. For running from restart: specify the name of a restart file. Specify outer-loop stopping criteria. Specify inner-loop / linesearch criteria. Additional optional stopping criteria Limits on parameter values in calibration process. Configuration of Dud algorithm.