Sky distribution of the sources in observation 1, with markers indicating good primary calibrators, q = 3 (big green circles), potentially good primary calibrators, q = 2 (medium-size yellow circles), and sources that are resolved or faint or both, q = 1 (small red circles). The gap in right ascension 17–18h and declination 60–68° is caused by the failure of two scans, as described in the text.
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