Logo   Fitting Interface For Transform Sag For Asphere 3 With Exponential Decay 3D
s2 = (ax+b)2 + (cy+d)2
z = (s2/r) / (1+(1-(k+1)(s/r)2)1/2) + A4*s4 + A6*s6 + A8*s8
z = z / (k * exp(xy))
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