Positions in the sky of the TGAS sources selected with Eq. (3)in three different parallax intervals. The first panel shows stars with 0 <ϖ< 2. mas: the outlines of the Orion A and B molecular clouds and the λ Ori dust ring are visible as regions with a lack of sources. The second panel shows the stars with parallax 2 <ϖ< 3.5 mas. Some density enhancements are visible toward the center of the field, (l,b) ~ (205,−18). The third panel shows foreground sources with ϖ> 3.5 mas.
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