Reversing Axes in 2D plots

Hello, all.

I have a 2D data set (pressure versus temperature), which I wish to display with pressure on the Y-Axis. Using the obvious
            myDisplay.addMap(new ScalarMap(myRangeType, Display.XAxis));
myDisplay.addMap(new ScalarMap((RealType), myDomainType.getComponent(0),Display.YAxis));
produces almost what I want: at the origin, the pressure coordinate has the 
lowest value in the data set, and at the top, it has the highest.
This is certainly the expected behavior for a generic data set, but it is a 
trifle unphysical in reference to an atmosphere, where the highest 
pressures occur at the "lowest" point.
Is there any obvious way to invert the scales of a scalar map?  I didn't 
see one in the javadoc, but that doesn't mean it isn't there.
        Edward


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