code: public void setMediumTickMarkWidthFactor(final double FACTOR) {
          if (null == mediumTickMarkWidthFactor) {
              _mediumTickMarkWidthFactor = Helper.clamp(0.0, 1.0, FACTOR);
              fireUpdateEvent(REDRAW_EVENT);
          } else {
              mediumTickMarkWidthFactor.set(FACTOR);
          }
      }
docs: The factor defines the width of the medium tick mark.
  It can be in the range from 0 - 1.
  
  @param FACTOR