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