td>
    </tr>
    <tr>
      <th>xaxes</th>
      <td><p>where to put x axis, or FALSE if no x axis ticks / labels</p></td>
    </tr>
    <tr>
      <th>yaxes</th>
      <td><p>where to put y axis, or FALSE if no y axis ticks / labels</p></td>
    </tr>
    <tr>
      <th>legend_location</th>
      <td><p>('top_right', 'top_left', 'bottom_left', 'bottom_right') the location where the legend should draw itself, or NULL to omit the legend</p></td>
    </tr>
    <tr>
      <th>tools</th>
      <td><p>character