>"[X title]"</span>,
  <span class='kw'>y_title</span> <span class='kw'>=</span> <span class='st'>"[Y title]"</span>, <span class='kw'>col_title</span> <span class='kw'>=</span> <span class='st'>""</span>, <span class='kw'>caption</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>legend_labels</span> <span class='kw'>=</span> <span class='kw'>NULL</span>, <span class='kw'>font_family</span> <span class='kw'>=</span> <span class='st'>"Helvetica"</span>,
  <span class='kw'>font