/**
  * Get the contour line color. Use associated <code>ContourLineAttribute</code> if it exists and
  * has colorOverrideen set to <code>false</code>.
  */
 public Color getColor() {
   if (attr_ != null && attr_.isColorOverridden()) {
     return attr_.getColor();
   } else {
     return super.getColor();
   }
 }