an><span class="op">$</span><span class="va">contours</span><span class="op">[</span>, <span class="fl">1</span><span class="op">]</span> <span class="op">==</span> <span class="fl">0</span>, <span class="fl">2</span><span class="op">:</span><span class="fl">3</span><span class="op">]</span></span></span>
<span class="r-in"><span><span class="fu">moments</span><span class="op">(</span><span class="va">contour0</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</spa