keeping Crystal angles constant

From: Mohan maruthi sena (
Date: Wed Jan 15 2014 - 12:03:58 CST

Hi all,
          I want to simulate a crystal which has lengths a,b,c and angles
alpha=90 deg, beta=97.4 deg and gamma=90 degrees. When I minimize the
structure , i get a different structure whose alpha=90,beta =90 and
gamma=90. My question is , How can i keep alpha,beta,gamma constant in my
namd simulations. Do I have to mention any keyword in namd configurations

Thanks for a reply in advance,

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