>]</span><span class="op">)</span></span></span>
<span class="r-plt img"><img src="Skulls-3.png" alt="" width="700" height="433"></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/graphics/pairs.html" class="external-link">pairs</a></span><span class="op">(</span><span class="va">sk.mod</span>, </span></span>
<span class="r-in"><span>      hypotheses<span class="op">=</span><span class="fu"><a href="https://rdrr.io/r/base/list.html" class="ex