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Images

The routine PGGRAY is used in a similar way to PGCONT. Instead of drawing contours, it shades the interior of the viewport, the intensity of shading representing the value of the function at each point. The exact appearance of the resulting ``image'' is device-dependent. On some devices, PGGRAY does the shading by drawing many dots, so it can be very slow.


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Tim Pearson, California Institute of Technology, tjp·astro.caltech.edu
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