C C Declare an array to hold an area map. C C Declare the routine which will draw contour lines, avoiding labels. C C Turn off the clipping indicator. C C Turn on the drawing of the high and low label boxes. C thicken it somewhat.
C C Generate an array of test data.
C C Put special values in a roughly circular area. C C Compute viewport parameters. For each of the four plots, use a different mapping function and C create a different background. C C Polar coordinates. IF C C Initialize the drawing of the contour plot.