Illustration of how the combination of scan law coverage and data filtering leads to gaps in the Gaia DR1 source distribution. The top panel shows the source density in the area of 0.5 degree radius around (α,δ) = (266°,−18.5°). The middle panel shows the median number of observations (i.e. focal plane transits) that were matched to each source. The bottom panel shows the predicted number of visits by Gaia according to the nominal scanning law.
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