> <span class="op">&lt;-</span> <span class="fu">make_EV</span><span class="op">(</span><span class="va">C</span><span class="op">)</span></span>
<span><span class="fu"><a href="https://rdrr.io/r/utils/head.html" class="external-link">head</a></span><span class="op">(</span><span class="va">EV</span><span class="op">)</span></span>
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<span><span class="fu"><a href="https://ggplot2.tidyverse.org/reference/ggplot.html" class="external-link">ggplot</a></span><span class="op">(</span><span class="va