 class="va">y1</span>,</span>
<span>  <span class="va">ycen</span>,</span>
<span>  <span class="va">x1</span>,</span>
<span>  <span class="va">xcen</span>,</span>
<span>  atsline <span class="op">=</span> <span class="cn">FALSE</span>,</span>
<span>  xnam <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  ynam <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  Title <span class="op">=</span> <span class="st">"Akritas - Theil - Sen line"</span>,</span>
<span>  ylim <sp