class="va">xamp</span>,</span>
<span>  <span class="va">xmean</span>,</span>
<span>  <span class="va">xcovar</span>,</span>
<span>  projection <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  weight <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  fixamp <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  fixmean <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  fixcovar <span class="op">=</span> <span class="cn">NULL</span>