For example:

Modeline "1024x768" 81.54 1024 1064 1168 1352 768 768 770 804

This is a 1024x768 resolution at 75 Hz.

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* Use the values on your own risk. There is no warranty.
If you are using a too high frequence you can destroy or damage your monitor or graphic card.

  This software is not designed or intended for use in on-line control of
  aircraft,  air traffic, aircraft navigation or aircraft communications; 
  or in the design, construction, operation or maintenance of any nuclear
  facility :-))))