span class="p">,</span> <span class="n">potential</span><span class="o">.</span><span class="n">charges</span><span class="p">(</span><span class="n">system</span><span class="o">.</span><span class="n">symbols</span><span class="p">))</span>

    <span class="c1"># Get lammps units</span>
    <span class="n">lammps_units</span> <span class="o">=</span> <span class="n">lmp</span><span class="o">.</span><span class="n">style</span><span class="o">.</span><span class="n">unit</span><span class="p">(</span><sp