Whit asked Machine shop to map the whole mirror and get 4 groups of data--x1, y1, x2, y2.
x1,y1
One Set of data, 90 deg difference
x2,y1
Rotate Mirror 45 deg, another set of data, 90 deg difference
1Q.pdf
Fit x1 through y2 by using function x^2/Q=z or y^2/Q=z, assuming y or x is zero.
2Q.pdf
Fit x1,y1 and x2,y2 by using function x^2/Q1+y^2/Q2=z
I find Q=1690mm=66in
Check the PDF file
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