code: protected BufferedImage create_TITLE_Image(final int WIDTH, final String TITLE, final String UNIT_STRING) {
          return create_TITLE_Image(WIDTH, TITLE, UNIT_STRING, null);
      }
docs: Returns the image with the given title and unitstring.
  @param WIDTH
  @param TITLE
  @param UNIT_STRING
  @return the image with the given title and unitstring.