Fig. 1.

Relation between the number of visibility periods and field-of-view transits (matched observations) per quasar in Gaia-CRF2. Like Fig. 2 of Lindegren et al. (2018), a small random number was added to the integer number of visibility periods to widen the vertical bars. The black line through each bar shows the location of the median. The red solid line is equal to 1.8 times the visibility periods.
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