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This clip describes the field aberration plot, and its meaning.

The field aberrations (astigmatism, distortion and lateral colour) are obtained by tracing a set of chief rays spaced along the Y axis.

We discuss what these aberrations mean and notew that they are independent of the aperture size.  We show a correlation between the astigmatism values and the behaviour of the spot diagrams, and look at the full field distortion plot

The clip ends with showing how to obtain a child table of the numerical values for these plots

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