span>  samples <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  start <span class="op">=</span> <span class="fl">0</span>,</span>
<span>  end <span class="op">=</span> <span class="st">""</span>,</span>
<span>  chrom <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  snps <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  snps_pageSize <span class="op">=</span> <span class="fl">10000</span>,</span>
<span>  samples_pageSize <span class="op">=</spa