pan class="va">col_var</span>,</span>
<span>  pal <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  pal_na <span class="op">=</span> <span class="st">"#7F7F7F"</span>,</span>
<span>  pal_rev <span class="op">=</span> <span class="cn">FALSE</span>,</span>
<span>  alpha_fill <span class="op">=</span> <span class="fl">0.5</span>,</span>
<span>  alpha_line <span class="op">=</span> <span class="fl">1</span>,</span>
<span>  alpha_point <span class="op">=</span> <span class="fl">1</span>,</sp