code: public Series<D> addPoint(final D point) {
  		if (this.data == null) {
  			this.data = new ArrayList<D>();
  		}
  		this.data.add(point);
  		return this;
  	}
docs: Adds a point to this series.
  
  @param point
  the point to add.
  
  @return a Series of points with the new point added to it