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Fig. 2

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Comparison of the image quality using a subband-based initial calibration technique and standard self-calibration procedure (left), a subband-based initial calibration and the self-calibration technique described in Sect. 2.2.2 (middle), and a channel-based initial calibration technique and the self-calibration technique described in Sect. 2.2.2 (right). The biasing of the flux towards the east and west direction and resulting sidelobes are easily visible in the first image. These effects nearly vanish in the second image and completely disappear in the last one. The images show only the first subband of the observations with 80 MHz bandwidth at λ22 cm without any primary beam correction.

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