AM CVn stars in the plane of the velocity in the direction of Galactic rotation (V_ϕ) and the Galactic centre(V_ρ) (left hand panel) and the orbital eccentricity (e) and the angular momentum in the Galactic z direction(J_z) (right hand panel). The solid and dotted ellipses render the 3σ thin and thick disc contours in the V_ϕ–V_ρ diagram, while the solid box in the e–J_z marks the thick disc region as specified by Pauli et al. (2006).