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				/*!
				\example demos/callout
				\title Callout demo
				\subtitle

				This demo shows how to draw an additional element (a callout) on top of the chart.
				\image demos_callout.png

				QChart class provides two methods that map between the scene coordinates and the series' domain (defines by the axes ranges).
				QPointF QChart::mapToPosition(const QPointF &value, QAbstractSeries *series)
				QPointF QChart::mapToValue(const QPointF &position, QAbstractSeries *series)
				*/

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