# Example 10 -- Draw image plot of flushing of dye out of cove

if !..publication..
    draw time stamp
end if
\file = "example10.dat"
query \contours "Superimpose contours? (yes|no)" ("yes")
query \file     "Input file name               " ("\file")
open \file
read line \header
read \D
read .nx.
read .ny.
set x name "distance along cove"
set y name "time"
set x grid 0 1 /.nx.
set x axis 0 1 0.5 0.1
set y grid 0 .ny. / .ny.
set y axis 0 .ny.
read grid data * * .ny. .nx.
set image range 0 20
set image grayscale black 20 white 0 increment 5
convert grid to image 
draw image
if {"\contours" == "yes"}
    set graylevel 1.0
    draw contour 0 20 1 unlabelled
    set graylevel 0.0
end if
draw axes
draw image palette left -1 right 21 increment 5
draw title "Example 10 -- file=\file header=`\header'"