ative machine libraries
this command is optional - if not used, a default
  mesh size will be chosen to satisfy accuracy criterion - if used, the
  specified mesh size will override the default
</PRE>
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<H3>
<A NAME="_cch3_931276947">pppm order </A></H3>
<PRE>
specify the order of the interpolation function that is used by &quot;coulomb
  style pppm&quot; to map particle charge to the particle mesh
order is roughly equivalent to how many mesh points a point charge
  overlaps onto in each dimension

Defau