cout << " --nsample Number of samples per axis per pixel (default = 1)" << endl;
cout << " --trace Trace level to use" << endl;
cout << " none No tracing (default)" << endl;
cout << " --nsample Number of samples per axis per pixel (default = 1)" << endl;
cout << " --trace Trace level to use" << endl;
cout << " none No tracing (default)" << endl;