(u, v) coverages of the RadioAstron imaging observations of 3C 84. Red and blue points show the data used in the final images from the ground and space baselines, respectively. The visibility data that were detected in global fringe fitting with AIPS (see Fig. 5) but later flagged in the imaging stage are shown by light red for the ground baselines and by cyan for the space baselines. Top-left panel: full (u, v) coverage in the C band. The dashed circles indicate the fringe spacings of 150 μas and 500 μas. Top-right panel: (u, v) coverage for the baseline lengths ≲250 Mλ in the C band. Bottom left panel: the full (u, v) coverage in the K band. The dashed circles indicate the fringe spacings of 100 μas and 30 μas. Bottom-right panel: (u, v) coverage for the baseline lengths ≲1000 Mλ in the K band. The black circles in the left panels highlight the scans between 06:10:00 UT and 06:50:00 UT on the second day of the observation. RadioAstron baselines make almost straight lines in the (u, v) plane while ground-only baselines are elliptical arcs.