[Gnuplot-info] how to plot a line in the contour map

[thorneliu <liu...@co...>]

Hello, every one!
Here is my question:
  I have a matrix data file (data in rows and collums),
  and I successfully got a contour figure by the following commands:
  
  set pm3d map
splot 'matrix.dat' matrix

Well, I got the figure as follows:
http://old.nabble.com/file/p28812980/Dis1550.jpg 

So, what can I do if I wanna plot a line in this contour figure?
(I wanna plot the line where z=0 in the x y plane)
Thanks a lot!
 
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