><a href="#cb7-14" tabindex="-1"></a><span class="co">#&gt; Non-zero voxels: 49 out of 102400 total</span></span>
<span id="cb7-15"><a href="#cb7-15" tabindex="-1"></a><span class="fu">cat</span>(<span class="st">&quot;Space savings:&quot;</span>, <span class="fu">round</span>((<span class="dv">1</span> <span class="sc">-</span> <span class="fu">as.numeric</span>(<span class="fu">object.size</span>(sparse_roi)) <span class="sc">/</span> </span>
<span id="cb7-16"><a href="#cb7-16" tabindex="-1"></a>         