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contour-plot & ascii-art


Someone can explain me how to create a
shaded contour plot together with a bar where the
various gray-levels have a numerical value
specified (a sort of termometer).
This is a very usual way of specifying the
``z-value'' associated with a gray-level.
I'm sure Mathematica has this feature.

/----------------\/-\
|                ||#| 50
|                ||#|
|                ||%| 40
|    contour     ||%|
|                ||%| 20
|                ||.|
|      plot      ||.| 10
|                ||.| 
|                || | 0
\----------------/\-/


Is it clear? (sorry for the very bad ascii-art! :-)

	Nicola Attico



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