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Fig. 1
Distribution on the sky of LS 5039, the phase calibrator J1825 − 1718, and the astrometric check source J1818 − 1108. The dashed line indicates the Galactic Plane. The arrows indicate the two phase calibrations obtained: direct, using J1825 − 1718 as phase reference; inverse, using LS 5039 as phase reference.
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