I have made an isosurface and there is a lot of banding on it, as you
can see in the image below.  Any tips on eliminating it, asides from
simply reducing the accuracy a few orders of magnitude?

#declare celly=function{pigment{cells}}
#declare fnoise=16;//40;

isosurface{
                function{y/160-
                celly((x+1000)/fnoise,y/fnoise,(z+1000)/fnoise)
                }
       accuracy 0.01
        threshold  0.0  //  .03
        contained_by {sphere{0,600}
        pigment{SeaGreen}         normal{bumps}
        finish{ambient 0.2}
        }

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