, </span>"Y"</span></span>
<span><span class="co">#&gt; $ matrix      <span style="color: #949494; font-style: italic;">&lt;list&gt;</span> &lt;&lt;matrix[11 x 9]&gt;&gt;<span style="color: #949494;">, </span>&lt;&lt;matrix[11 x 12]&gt;&gt;<span style="color: #949494;">, </span>&lt;&lt;matrix[4 x 2]&gt;&gt;</span></span>
<span></span>
<span><span class="co"># To access one of the matrices, try one of these approaches:</span></span>
<span><span class="op">(</span><span class="va">EnergyMats_2000</span> <span