From: Joseph Bylund (
Date: Tue Oct 13 2009 - 10:39:52 CDT

Based on my understanding of selection syntax these two expressions
should select an identical subset of atoms, however that's not what I'm
experiencing. Should there be a difference and if so how can one
interpret these two expressions
"carbon and within 5 of resid 500"
"within 5 of resid 500 and carbon"