Harmonic force Keyword "centers" significance

From: Rabeta Yeasmin (rabetayeasmin_at_gmail.com)
Date: Wed Jun 21 2017 - 17:40:43 CDT

Dear NAMD users,

I am trying to restrain the distance between two residue during the
umbrella sampling simulation. I have plan to use colvar and harmonic force
to do this. I believe "distance" option of colvar can do this. But I can
not understand the significance of the keyword centers in harmonic force
section. What is its role here?

I will be grateful if anyone can help me to find out this.


Rabeta Yeasmin

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