Third order wavefront aberration
Full wavefront aberration taking account of cos n$ term
Mean of the square of the wavefront aberration
Square of the mean wavefront aberration
The wavefront aberration associated with Q
Average value of the nth power of Wq
Root-mean-square (rms) wavefront aberration
Angular separation in the image plane of the point Q from Q0 (diffraction theory)
Normalized form of the diffraction angle w
Radius (angular) of the first dark ring in the Airy disk
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