) or can give
  3 numeric values
using the charmm keyword means use the CHARMM force field
  settings of 0.0 0.0 0.0, requiring that pair-specific 1-4 interactions
  be read in individually (see &quot;dihedral style charmm&quot; command)
using the amber keyword means use the AMBER force field
  settings of 0.0 0.0 N, where N = 0.5 for Van der Waals 1-4 interactions
  and 1.0/1.2 for Coulombic 1-4 interactions

Default = CHARMM force field values of 0.0 0.0 0.0
</PRE>
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