Fig. 3
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Common linear features that can be mistaken for asteroid trails in images taken with the VST, at an altitude of 2635 m: edge-on galaxies (a), satellites (b), diffraction spikes (c), and cosmic rays (d). All images were taken with an exposure time of 360 s and a seeing of ≈0.6″. The altitude above the horizon was 71° for panels a, c and d, and 56° for panel b.
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