notation <span class="op">=</span> <span class="fu">RCLabels</span><span class="fu">::</span><span class="va"><a href="https://matthewheun.github.io/RCLabels/reference/arrow_notation.html" class="external-link">arrow_notation</a></span><span class="op">)</span></span>
<span><span class="co">#&gt;                          MD MD Light</span></span>
<span><span class="co">#&gt; Electricity [from Coal]   1  2     3</span></span>
<span><span class="co">#&gt; Electricity [from Solar]  4  5     6</span></span></co