7020">dihedral style </A></H3>
<UL>
    <LI>
    none = compute no dihedrals 
    <LI>
    harmonic = simple harmonic dihedrals (class 1) 
    <LI>
    multiharmonic = multiple simple harmonic dihedrals (class 1) 
    <LI>
    class2 = class 2 dihedrals (and associated cross terms) 
    <LI>
    charmm= simple harmonic dihedrals + charmm 1-4 interactions 
</UL>
<PRE>
define style of dihedral interactions to use for all 4-body terms
must be used before the &quot;read data&quot; command (if not using the
  de