code: public DialSeries addSeries(String seriesName, double value, String annotation) {
  
      // Sanity checks
      sanityCheck(seriesName, value);
  
      DialSeries series = new DialSeries(seriesName, value, annotation);
  
      seriesMap.put(seriesName, series);
  
      return series;
    }
docs: Add a series for a Dial type chart
  
  @param seriesName
  @param value
  @param annotation
  @return