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• offset() : QCPAxis
• ohlcSelectTest() : QCPFinancial
• openGl() : QCustomPlot
• operator!=() : QCPColorGradient , QCPDataRange , QCPDataSelection , QCPRange
• operator*=() : QCPRange , QCPVector2D
• operator+=() : QCPDataSelection , QCPRange , QCPVector2D
• operator-=() : QCPDataSelection , QCPRange , QCPVector2D
• operator/=() : QCPRange , QCPVector2D
• operator<<() : QCPDataRange , QCPDataSelection , QCPRange , QCPVector2D
• operator=() : QCPColorMapData
• operator==() : QCPColorGradient , QCPDataRange , QCPDataSelection , QCPRange
• opposite() : QCPAxis
• orientation() : QCPAxis
• outerRect() : QCPLayoutElement
• outlierStyle() : QCPStatisticalBox