Determines the center of gravity of the whole PDB file entered. All atoms
that are 'correct' are being used, including protons, and waters. Besides
the centre of gravity, the extremes are calculated too.
If you have detected any error, or have any question or suggestion,
please send an Email to Gert Vriend.
Roland Krause, Maarten L Hekkelman, Jens E Nielsen,
Gert Vriend.
