UV diagram (left panel) and Toomre diagram (right panel) for the thin- and thick-disk white dwarf population (black and red dots, respectively, and we highlight with color those that belong to the selected overdensity region). We also plot the structures Her a (blue circles), Her b (blue triangles), and Her c (cyan circles) that we found here. We show the location of the Hercules substreams from Antoja et al. (2012) in the UV plane with yellow squares.