Topography as measured (curvature radius [mm] as function of location).
Approximation by Zernike-series of 4. radial order (15 elements).
Approximation by Zernike-series of 6. radial order (28 elements).
Approximation by Zernike-series of 8. radial order (45 elements).
Approximation by Zernike-series of 10. radial order (66 elements).
Approximation by Zernike-series of 12. radial order (91 elements).
