Chemo-dynamical properties of Sculptor. (a) / (d) panels: Normalized metallicity and l.o.s. velocity distribution of the spectroscopically observed member stars of Sculptor fitted by the 3-pop model. The dashed-lines indicate the predicted distribution of our models: red for the MR component, blue for the MP, green for the third population, and black for the sum of the three components as indicated in the label. Bands indicate the 1σ confidence intervals. (b) / (c) panels: Projection of the stars in the v_los vs [Fe/H] / R vs v_los planes. In each panel, the stars are color-coded by the population to which they have the highest probability of belonging, red for the MR, blue for the MP and green for the third population as indicated in the label. The systemic velocity of Sculptor is indicated with straight dashed lines.