">&quot;nanowires&quot;</span><span class="p">,</span>
        <span class="s2">&quot;onlyharmonic&quot;</span><span class="p">,</span>
        <span class="s2">&quot;espresso&quot;</span><span class="p">,</span>
    <span class="p">]</span>

    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span>
        <span class="bp">self</span><span class="p">,</span>
        <span class="n">ngrid</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><spa