/**
  * Get the contour label height. Use associated <code>ContourLineAttribute</code> if it exists and
  * has labelHeightPOverrideen set to <code>false</code>.
  */
 public double getLabelHeightP() {
   if (attr_ != null && attr_.isLabelHeightPOverridden()) {
     return attr_.getLabelHeightP();
   } else {
     return labelHeightP_;
   }
 }