             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>
<span><span class="va">df</span> <span class="op">&lt;-</span> <span class="fu">tibble</span><span class="fu">::</span><span class="fu"><a href="https://tibble.tidyverse.org/reference/tibble.html" class="external-link">tibble</a></span><span class="op">(</span>mats <span class="op">=</span> <span class="fu"><a h