code: public PointSeries addNumbers(final List<Number> values) {
  		for (Number number : values) {
  			addNumberPoint(number);
  		}
  		return this;
  	}
docs: Adds a list of point with only numbers.
  
  @param values
  the number values to add.
  
  @return a PointSeries object with the new points added to it