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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 (defined by the axes ranges).
QPointF QChart::mapToPosition(const QPointF &value, QAbstractSeries *series)
QPointF QChart::mapToValue(const QPointF &position, QAbstractSeries *series)
*/
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