Fig. 4
Locations of the antenna pointing positions used to test the primary beam attenuation of the VLBA antennas, shown on top of an NVSS postage stamp. 3C 84, in the image centre, has always been used as the field centre in the correlation, so that it was seen by the antennas through the various parts of the primary beam power pattern, the FWHM of which is indicated by the circle.
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