3D views of the Per-Tau shell (for an interactive version of this figure click here ; see Figure 5 for more static visualizations). Plotted are density iso-surfaces at levels n = 5 cm⁻³ (gray) and n = 25 cm⁻³ (color), overlaid with our spherical-shell model, radius R_s = 78 pc, distance from the Sun d = 218 pc. The n = 25 cm⁻³ surfaces are colored by distance from the Sun (blue-to-red). Top-left panel: view from the Sun (compare with Figure 1). Top-right panel: a side view of the region. Perseus and Taurus and their diffuse envelopes are arranged on two opposing sides of the Per-Tau shell. Bottom-left panel: another side view emphasizing the Tau Ring. The ellipse is the Tau Ring model (Appendix B). Bottom-right panel: 2D density slices along the xy, xz, yz planes. All planes intersect at shell’s center. In all panels xyz are the Heliocentric Cartesian Galactic Coordinates.

An interactive version of this figure is available in the online journal.