Resonance trapping in a potential with a triaxial NFW halo with p = 1.02 and q = 1.19. The left panel depicts with different colours the variation in angular momentum, $\mathrm{\Delta }{L}_{y,z}=\sqrt{\mathrm{\Delta }{L}_y^2+\mathrm{\Delta }{L}_z^2}$, at different L_z and L_⊥ but at a fixed energy and position. The 6D phase space coordinates of a subclump star, which is resonantly trapped in this potential and shown with the cyan star symbol, were used to set the energy and position of the orbits. ΔL_{y, z} is a proxy for how resonantly trapped an orbit is by the Ω_ϕ:Ω_z = 1:1 resonance, with a lower value indicating a more resonantly trapped orbit. For reference, the hiL stars and loL stars are shown as red and blue star symbols, respectively. The right panel shows orbits in Galactocentric Cartesian coordinates (y, z) corresponding to the fixed energy and position and different L_z and L_⊥ as given by the grid on the left panel. Orbits that are on the Ω_ϕ:Ω_z = 1:1 resonance appear as a line in this plane, as they are two-dimensional structures. Resonantly trapped orbits occupy a larger volume and are flattened three-dimensional structures.