Quantities which are necessary for ray tracing in any case are used to calculate the geometrical and optical path differences. Proceeding from the optical path difference, the coefficients of the power series of the wave-aberration function are fitted by a method of least squares up to the eighth degree. For a triplet the surface contributions of the different terms of the aberration function and their sums are represented graphically and numerically. Different checks of validity show not only the accuracy but also the uncertainty of the method in each special case.
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