PREF — Define the energy window penalty coefficient.
 PREF=n.n
			The range for the energy window penalty is set by FREF and SREF. For conformations with energies outside of this window, a quadratic penalty is applied. The coefficient for this penalty is specified by PREF. The default value is 10% of the initial temperature. This can be used with GANNEAL, TSANNEAL, and MANNEAL but not ANNEAL.
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