code: private static SeriesDefaults createDonoutSeriesDefault() {
  		return new SeriesDefaults().setRenderer(SeriesRenderers.DONUT)
  				.setRendererOptions(new DonutRenderer().setSliceMargin(SLICE_MARGIN).setStartAngle(START_ANGLE).setShowDataLabels(true)
  						.setDataLabels(DataLabels.VALUE));
  	}
docs: Creates the donout series default.
  
  @return the series defaults