n>
<span id="cb7-12"><a href="#cb7-12" tabindex="-1"></a><span class="co">#&gt; Sparse size: 8.3 Kb</span></span>
<span id="cb7-13"><a href="#cb7-13" tabindex="-1"></a><span class="fu">cat</span>(<span class="st">&quot;Non-zero voxels:&quot;</span>, <span class="fu">length</span>(roi), <span class="st">&quot;out of&quot;</span>, <span class="fu">prod</span>(<span class="fu">dim</span>(img)), <span class="st">&quot;total</span><span class="sc">\n</span><span class="st">&quot;</span>)</span>
<span id="cb7-14"