Logo   Fitting Interface For Roman Surface (plus) Offset XY Plus Plane 3D
z = (k((y+b)2-(x+a)2) + ((x+a)2-(y+b)2)sqrt(k2-(x+a)2-(y+b)2)) / (2((x+a)2+(y+b)2))
z = z + (d * x) + (f * y) + g
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