Restoring beam sizes as a function of declination. For all pointings, the red and blue dots are the fit sizes of the restoring beam major and minor axes, respectively. On average, the binned major axis sizes follow an increasing trend (black solid line; dashed lines represent the one sigma scatter) that is compatible with the shortening of N-S baselines due to elevation projection. The choice of restoring beam sizes for the mosaics (red and blue solid lines for major and minor axes, respectively) are a trade-off between enveloping the majority of the fit beam sizes, maintaining high resolution, and enforcing a circular beam towards the north celestial pole.
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