lass="op">=</span> <span class="cn">NULL</span>, units <span class="op">=</span> <span class="cn">NULL</span>, ret_units <span class="op">=</span> <span class="cn">FALSE</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">dens</span><span class="op">(</span>T <span class="op">=</span> <span class="cn">NULL</span>, units <span class="op">=</span> <span class="cn">NULL</span>, ret_units <span class="op">=</span> <span class="cn">FALSE</span><span class="op">)</span></span>
<span></span