Normalized probability density function of the stars selected with Eq. (5)(Gaussian kernel with bandwidth =0.3°). The density enhancements visible in the center of the field (Galactic longitude between 200° and 210°, Galactic latitude −20° and −15°) are related to the TGAS density enhancements (the black dashed contours correspond to the S = 3 levels of the TGAS density map of Fig. 4). The peak at (l,b) ~ (206,−12.5) deg corresponds to the open cluster NGC 2112.