Precision of Coordinate data

From: Rick Calloway (
Date: Tue Sep 22 2009 - 12:08:34 CDT

Hi community,
Can someone help me better understand the precision of the output coordinate
I am looking for statistically significant movement of the center of mass of
a large molecule. Using VMD's measure center command returns angstroms out
to 15 decimal places and looks quite tempting.
If the last 12 or so decimal places had meaning I could significantly reduce
the runtime for my system.
How can I determine how many of these digits are significant?
Thank you in advance.
Rick Calloway

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