how to constrain a dihedral angle?

From: xiaojing gong (gongxiaojing1981_at_yahoo.com.cn)
Date: Thu Mar 23 2006 - 18:55:34 CST

Dear all,
          I want to constrain a dihedral angle so that it can maintain a constant value during the simulation, BUT I don't konw how to do that? Could anyone help me?
  GXJ

                
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