Radial primary beam models as a function of radius from the pointing center. The black dotted line indicates the original model as provided by the GMRT, while the red dotted line indicates the updated model used for this work. The black dots are ratios of the apparent over model flux density of all flux calibrators (except 3C 286) described by Scaife & Heald (2012), plotted as a function of radial distance from the center of the pointings in which they appear (typically multiple pointings per calibrator). The updated beam model fits these data points within a few percent, except for 3C 286 (blue dots). The latter flux densities needs to be scaled up by a factor of about 1.55 to make them line up with the beam model (red dots).
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