View of a slice through the 3D gas solutions for the sub-solar longitude of 140°. The plane shown is normal to the terminator plane, and has been chosen such that the highest-activity regions can be seen. The views do not reflect the geometry of “image A” in Sect. 4. The direction of the Sun is in the shown plane, the rotation axis of the comet comes out of the plane but has the same projected direction as the Sun direction in this view. The top row shows the gas number density [log₁₀(m^-3)] for the five models (columns). The bottom row shows the gas speeds [m s^-1] for the five models (columns). The 3D shape of the comet is also displayed.