This scene renders a height_field using a 16-bit PGM file in POV 3.1G while
the same scene in 3.5 looks scrambled.  Does this have something to do with
the new PPM libraries?  I'll try uploading the file for this scene to the
binaries group but I suspect it may be too big...

light_source {<0, 20, 0> color rgb <1, 1, 1>}

camera {location <0, 1, 0>

look_at 0
}

height_field {
pgm "KingstonEast.pgm"
smooth
translate <-.5, 0, -.5>
scale <1, .1, 1>
pigment {color rgb <1, 1, 1>}
}

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