Primary beam (PB) correction images for each cluster, adopting natural weighting. Thus final PB-corrected images would correspond to Figs. 1–3 divided by the corresponding PB corrections shown here. Likewise, the final sensitivity corresponds to the measured sensitivity divided by the PB image. For A2744 the sensitivity is uniform across the mosaic, while for MACS J0416 there is a clear sensitivity gradient from top right to bottom left, and in MACS J1149 the upper and lower regions of the mosaic have sensitivities substantially lower than in the uniform middle portion (See Sect. 2.4 for details).
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