Restraint on XY Plane

From: Peixi Zhu (tulanezhu_at_gmail.com)
Date: Thu Oct 14 2010 - 16:12:30 CDT

Hi,

I found from the following thread about creating a cylindrical constraint
for ABF simulation by using distanceZ and distanceXY variables:

http://www.ks.uiuc.edu/Research/namd/mailing_list/namd-l/11881.html

Can someone give out an example of the colvars input file? And if I use
umbrella sampling rather than ABF to calculate PMF(z), can I constraint
atoms in a similar way?

Thanks a lot,

--Peixi

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