pan> <span class="operator">=</span> <span class="function">get_slice</span> [<span class="type">All</span>; <span class="type">R</span> [<span class="number">1</span>; <span class="number">3</span>]] <span class="keyword">a</span>

<span class="comment">(* Reduction *)</span>
<span class="keyword">let</span> <span class="keyword">c</span> <span class="operator">=</span> <span class="function">mean</span> <span class="operator">~</span><span class="keyword">axes</span><span class="operator">:</span>[<span c