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Basically, you should provide data by JSON format like follows.
[ {"x": "2012-01-01T00:00:00+09:00", "y": 4, "y1": 3, "y2":2}, {"x": "2012-02-01T00:00:00+09:00", "y": 2, "y1": 4, "y2":3}, {"x": "2012-03-01T00:00:00+09:00", "y": 1, "y1": 2, "y2":0} ]