Toy model perturbations to the disk. The bottom panel shows n and for |z|< 300 pc and is analogous to Figs. 9 and 10. The dotted line corresponds to the disk area covered in Fig. 9. In the top three panels, we show the number counts in the (z, w)-plane at the points A, B, and C that are highlighted in the lower panel. In order to facilitate a comparison between them, an iso-energy contour for the unperturbed disk is shown as a dashed line.