[Paraview] XY Plot question

[Eric Allison]

Apologies if this is a dumb question - I'm investigating Paraview as a  
replacement for Tecplot, and one of the things I'd really like to do  
is take Cp slices on CFD geometries. I figured out how to make an XY  
plot of the slice data, but can't for the life of me figure out how to  
reverse the Y axis so that Cp displays the way aero people like to see  
it. (smaller numbers at the top, larger at the bottom).

Any help would be appreciated.