ss="reference external" href="https://docs.python.org/3/library/stdtypes.html#list" title="(in Python v3.11)"><em>list</em></a><em>, </em><em>optional</em>) – One or two model symbols to assign to the atoms.</p></li>
<li><p><strong>number_of_steps_r</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.11)"><em>int</em></a><em>, </em><em>optional</em>) – The number of evaluation steps to use for the r spacing.</p></li>
<li><p><strong>min