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Fig. 1.

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u, v-coverage for RadioAstron observations at 1.6 GHz (left panel) and 4.8 GHz (right panel) presented in this work. The central bulge (in grey) of u, v-tracks span about one Earth diameter (ground stations baselines), while the “wings” (in colors) represent the RadioAstron Space-baselines contribution. Only space-segments giving fringes are plotted, i.e., up to a maximum projected space–ground baseline of ∼4.5 ED at 1.6 GHz and ∼3.3 ED at 4.8 GHz.

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