(Multiplicative (7.20) response)

The function (20) can be written in a more general form. Let the baseline vector B be directed toward the right-hand telescope in Fig. 7a with magnitude B(m). Introduce s as a unit vector in the direction of the source and 9 the angle between s and B, consistent with our earlier definition. The term B cos 9(t) in (20) can then be expressed in terms of a dot product, and (20) becomes

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