Stellar number density variations in the (X, Y)-plane of the data sample with 2 < M_G ≤ 3, for different bins in height. The left (middle) column shows the density variations north (south) of the mid-plane as the ratio of the GP and symmetric analytic fit (as described in Sects. 3.3 and 3.4, respectively). The right column shows the asymmetries between the north and south of the GP fits, where each row corresponds to a specific range in height with respect to the mid-plane location when fitting f_symm.. The arrows in the top right panel show the directions of the Galactic centre and Galactic rotation. The axes ranges are shared between all panels.