Distribution of low-metallicity stars from the INT sample in the J_ϕ−J_ɀ action space. The action quantities are scaled by the solar values (i.e., Jϕ⊙ = 2009.92 kpc km/s, J_ɀ⊙ = 0.35 kpc km/s). The two black boxes represent the prograde and the retrograde disc-like orbits showing an overdensity in the prograde direction. All EMP stars observable by the spectroscopic follow-up program at INT are shown in grey.