ne" href="namespacenetdem.html#aa088f3b9daf31efbeb49c18db267c791">   19</a></span><span class="keyword">using </span><a class="code hl_typedef" href="namespacenetdem.html#aa088f3b9daf31efbeb49c18db267c791">Vec4d</a> = std::array&lt;double, 4&gt;;</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"><a class="line" href="namespacenetdem.html#ad38442e20f0a9c4e248bca3f93b4c712">   21</a></span><