# Example 4 -- Simple contour graph

#
# Read x-grid; blank-line means stop reading.
read grid x
0
.2
1

# Note that the x-grid was irregular.  The y-grid
# in this example is regular, so we can just set
# it to range from 10 to 20, incrementing by 2.5.
set y grid 10 20 2.5
# Thus we now have a grid 3 wide and 5 high.  Let's
# read the actual data now.
read grid data
1 2 3
2 3 4
3 4 5
4 5 6
5 6 7
# Now draw contours (automatically set; we could
# have done `draw contour 2' to draw contour fro
# value 2 or `draw contour 1 10 2' to draw contours
# ranging from 1 to 10 with an increment of 2.)
draw contour
draw title "Example 4"