The well-known Fourier Transform relationship between the complex illumination function and the diffraction pattern of an aperture has been applied to measurements of the reception patterns of dishes of the 5-km telescope; the results have provided contour maps showing the distribution of reflector surface errors with an accuracy of ~ 0.1 mm. By repeating the measurements at different zenith angles the structural deflections due to gravity were investigated.
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Scott et al. (1977) studied this question.