I want to plot one data series against two axes. I can get the secondary axes

and I can get it onto the x axes at the top. What I want is to get the second

axes to be dependent on the first. You see the second axes is the volume

fraction of a composite ply and the first is the weight fraction. I want to

create a graph so that the data series I plot can be looked up by either the

volume fraction or the weight fraction. The problem is that the volume

fraction axes scale needs to be irregular since it's a nonlinear function of

the weight fraction. Firstly, I'd like to know if that's possible.

If so,

HOW DO I DO IT?

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