Coverage of the Fourier domain (uv coverage) of the RadioAstron observation of 0642+449 at 1.6 GHz (λ = 18 cm), plotted in units of Mλ. The central part corresponds to the perigee imaging segment (GK047A) and the short segment at v ≈ 400 Mλ represents the long-baseline tracking segment (GK047C). Color marks the upper limit of brightness temperature obtained from visibility amplitudes (for details, see discussion in Sect. 4.1).
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