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Comparison of fitting errors: (a) Fitting error between experimental and calculated images using different ϕ parametrizations, for actuator 22. The different parametrizations are Gaussian (G), from 2nd to 8th order Zernike parameters (2nd-8th), biharmonic parametrization using 8 parameters (B8), and biharmonic parametrization using 110 parameters (B110). (b) The total fitting error between the experimental and calculated images for all actuators.
