 the style to none
coefficients for all improper types must be defined in the data (or restart)
  file by a &quot;Improper Coeffs&quot; entry or by &quot;improper coeff&quot;
  commands before a run is performed

Default = harmonic
</PRE>
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<H3>
<A NAME="_cch3_951437278">maximum cutoff</A></H3>
<PRE>
specifies the longest force cutoff that will be used in any runs
this value is used by LAMMPS to accurately allocate memory
  for neighbor arrays
if the value is inaccurate (e.g. the command is not used), it