 <span class='kw'>nb_ticks_x</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>nb_ticks_y</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>legend_position</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>ci_wv</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>point_cex</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>point_pch</span> <span class='