 The remaining columns are Country, Year, matrix.name, and matrix</span></span>
<span><span class="fu"><a href="https://pillar.r-lib.org/reference/glimpse.html" class="external-link">glimpse</a></span><span class="op">(</span><span class="va">EnergyMats_2000</span><span class="op">)</span></span>
<span><span class="co">#&gt; Rows: 3</span></span>
<span><span class="co">#&gt; Columns: 4</span></span>
<span><span class="co">#&gt; $ Country     <span style="color: #949494; font-style: italic;">&lt;chr&gt;</spa