Total energy vs. angular momentum in the z direction for the stars in our sample. Top panel: C-normal stars are represented by black stars, while CEMP stars are denoted by red stars. Bottom panel: the same sample of stars, with blue filled star symbols indicating CEMP-no members of the inner halo; the orange filled square symbol represents the CEMP-no and CEMP-s members of the outer halo. The green dashed curve denotes the locus of the points that possess constant apogalactic radius, rapo = 15 kpc, while the golden dotted–dashed horizontal lines shows the values of the energies delimiting the transition zone.