Bvw

(Extended source)

which can readily be confirmed by expanding the exponentials according to the definition, e+if = cos Z + i sin Z and retaining only the real part. (We drop the "Re" label from here on.) The term outside the integral is the sinusoidal response expected for a hypothetical point source at phase center; see (21) and Fig. 6e. The integral modifies this function to give the correct response for the extended source.

The structure information is contained completely in the integral which is called the visibility V (b),

beam

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