="va">alpha</span>,</span>
<span>  <span class="va">color</span>,</span>
<span>  <span class="va">fill</span>,</span>
<span>  <span class="va">group</span>,</span>
<span>  <span class="va">linetype</span>,</span>
<span>  <span class="va">linewidth</span>,</span>
<span>  <span class="va">lineend</span>,</span>
<span>  <span class="va">linejoin</span>,</span>
<span>  <span class="va">linemitre</span>,</span>
<span>  <span class="va">arrow</span>,</span>
<span>  <span class="va">xlab</span>,</span>
<span>  <sp