/**
  * Gets the mode.
  *
  * @return the mode.
  */
 public int getMode() {
   if (radio_peak.isSelected()) return DefaultStarDetector.MODE_PEAK;
   if (radio_aperture.isSelected()) return DefaultStarDetector.MODE_APERTURE;
   return DefaultStarDetector.MODE_PIXEL_AMOUNT_OVER_THRESHOLD;
 }