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(x*255/127-1)*step(127/255-x)+step(x-128/255)*(x*255/127-128/127) from x = 0.45 to 0.55
(x*255/127-1)*step(127/255-x)+step(x-128/255)*(x*255/127-128/127) from x = 0.45 to 0.55
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