[Mg/Fe] abundance ratio of prograde (positive L_z) stars with −1.2 < [Fe/H]<  − 0.8 as a function of radial action (J_R). The green squares show stars that satisfy the selection criteria a and b, while the gray points are selected without the log g selection. The lower (upper) boundary of for Gaia-Enceladus (in situ) star selection is indicated. This figure illustrates that the selection in J_R efficiently selected Gaia-Enceladus and in situ stars with high purity.