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Non-linear axis

I am trying to add axis to an image. This part works (using a contour
for the axis and matching the image size and plot window). My problem
is that I would like to have one of the y-axis with a non-linear
in this particular case it is basically y1*y1. I tried something with
reading in the tickvalues, calculating the new values and than using
YTICKNAMES, but IDL still does the y-scale linearly. Any hints,
pointers, etc would be more
than welcome.

Irene Dumkow