[Gnuplot-info] Help with colored contour

[John A. <ban...@ya...>]

  Hi,
   
  I want to draw a contour plot in gnuplot but 
  I want all the positive contours to be colored red 
  and all negative contours colored blue. I tried Pm3d 
  but I don't like the color variations. I just want all 
  negative values (irrespective of magnitude) blue and 
  all positive values red.
   
  Thank you 
   
  John Appleton