�� The MPI command for running LAMMPS in parallel.  If not given, LAMMPS
will run serially.</p></li>
<li><p><strong>sizemults</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#list" title="(in Python v3.11)"><em>list</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#tuple" title="(in Python v3.11)"><em>tuple</em></a><em>, </em><em>optional</em>) – The three System.supersize multipliers [a_mult, b_mult, c_mul