Fig. 1.
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Naturally weighted CLEAN image of the phase calibrator J0442+5436 at 4.5 GHz. The peak brightness is 29.8 mJy beam−1. The 1-σ image noise level is 41.4 μJy beam−1. The first contours are at ±3σ, and the positive contours increase by a factor of two. The synthesised beam shown in the lower left corner is 1.8 mas × 4.2 mas with the position angle of the major axis at 
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