<< "--linkall \t Link pan, zoom and spatial position of crosshair in images." << std::endl
<< "--log \t Log output messages in vv-log directory." << std::endl
<< "--state file \t Read display parameters from file." << std::endl
<< "--linkall \t Link pan, zoom and spatial position of crosshair in images." << std::endl
<< "--log \t Log output messages in vv-log directory." << std::endl
<< "--state file \t Read display parameters from file." << std::endl