Retrieves the
Axis object representing the secondary y-axis of the XYChart.
By default, the primary y-axis is the y-axis on the left side of the plot area (bottom side if
XYChart.swapXY is in effect), and the secondary y-axis is on the right side of the plot area (top side if
XYChart.swapXY is in effect). You may interchange their positions using
XYChart.setYAxisOnRight.
The
Axis object representing the secondary y-axis of the XYChart.
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