nd should be used before &quot;read data&quot;
  to tell LAMMPS how big a force cutoff is being used, the 
  &quot;maximum cutoff&quot; command can also serve this purpose
when running from a restart file, the restart file contains the nonbond
  style and nonbond cutoffs (but not the offset flag), so it is often
  not necessary to use a &quot;nonbond style&quot; command before &quot;read restart&quot;,
  however LAMMPS still needs to know what the maximum cutoff will be
  before the restart file is read, se