Shallot visualisation of the disc radius. The first row shows the full extent of the grid with no restrictions applied. The second row shows the grid after applying just a Hill radius cut at 2 ∆_ecl. The third row shows the grid after applying just a cut due to a projected gradient at t = 0.45 ∆_ecl with a value of g(t) = 0.1. The fourth row shows the grid after applying both the projected gradient and Hill radius cut. Left: grid slice with ƒ_R = 2 when the disc is stretched horizontally. Middle: grid slice with the minimum radius disc (ƒ_R = 1). Right: grid slice with ƒ_R = 2 when the disc is stretched vertically.