... that

Actually, for a Gaussian beam, the illumination function on the entry of the horn is not flat (but is Gaussian) and the size of the horn has to be larger that what is quoted here by a factor of about 2.

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... baselines

Equivalent baselines are sometimes called redundant baselines in the literature. They correspond to different pairs of horns separated by the same vector and therefore corresponding to the same point in (u,v) space.

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... as

Obtaining such pure E and B modes is a complex issue in itself and deserves a full study.

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