code: public void setTrackStop(final double TRACK_STOP) {
          // check values
          if (Double.compare(trackStart, TRACK_STOP) == 0) {
              throw new IllegalArgumentException("Track stop value cannot equal track start value");
          }
          trackStop = TRACK_STOP;
          validate();
          fireStateChanged();
      }
docs: Sets the track stop value of the gauge to the given value
  @param TRACK_STOP