Adds a series or if a series with the same key already exists replaces the data for that series, then sends a {@link DatasetChangeEvent} toall registered listeners.
@param seriesKey the series key (null not permitted).
@param data the data (must be an array with length 3, containing threearrays of equal length, the first containing the x-values, the second containing the y-values and the third containing the z-values).
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