r any of the 147 named CSS colors, e.g 'green', 'indigo' - for glyphs with both fill and line properties, see "Handling color" below</p></td>
    </tr>
    <tr>
      <th>alpha</th>
      <td><p>the alpha transparency of the glyph between 0 (transparent) and 1 (opaque) - if glyph has both fill and color properties, see "Handling alpha" below</p></td>
    </tr>
    <tr>
      <th>legend</th>
      <td><p>either a logical specifying not to plot a legend for this layer (FALSE) or a string indicating the name o