ously differentiable everywhere
for debye style, an exp(-kappa*r) screening is added to the Coulombic
  interaction

Default = cutoff 10.0   for real units
          cutoff 2.5    for lj units
</PRE>
<HR>
<H3>
<A NAME="_cch3_931277080">create group </A></H3>
<UL>
    <LI>
    1st parameter = style of group of atoms 
    <LI>
    2nd-Nth parameters = coeffs 1 to N-1 
</UL>
<PRE>
styles:
</PRE>
<UL>
    <LI>
    types = range of atom types 
    <LI>
    molecules = range of molecule IDs 
    <LI>
    region =