span><span class="fl">2</span><span class="op">]</span><span class="op">]</span>, type <span class="op">=</span> <span class="st">'l'</span>, xlab <span class="op">=</span> <span class="st">'Iteration'</span>,</span></span>
<span class="r-in"><span>     ylab <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/expression.html" class="external-link">expression</a></span><span class="op">(</span><span class="va">sigma</span> <span class="op">^</span> <span class="fl">2</span><span class=