pan></span>
<span>  title.main <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  title.ref <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  title.rowvar <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  title.colvar <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  title.unitvar <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  title.estvar <span class="op">=</span> <span class="cn">NULL</span>,</span>
