    # 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'"