A ``welcome'' banner should appear in the terminal window with the version number of the program. If this does not happen check with your system administrator that FIT2D has been installed and that your PATH is properly defined (see Section 26.1, Page ).
After the header information a graphics window should be started as a separate window. If FIT2D cannot open the graphics window for some reason it will output an error message in the terminal window with suggested causes of the problem and possible solutions. If no error message appears, but the graphics window does not appear, check the definition of the DISPLAY variable e.g. printenv DISPLAY RETURN. Other potential start-up problems are covered in Section 26.2, Page .
Assuming everything has been set-up properly, the graphics window should have been opened and FIT2D will be waiting for graphical input in one of four buttons: CONDITIONS, I ACCEPT, HELP or DON'T ACCEPT.
Whilst FIT2D is running keep the terminal window visible, even when running in the graphics mode. Useful information, warning, and error messages often appear in the terminal window.