Properties of the sample of spectroscopically observed member stars of the Sextans dSph, not including the nine probable members, with reliable [Fe/H] information. Panel a: normalized [Fe/H] distribution with the best-fitting two-population model. The dashed lines indicate the predicted distribution of our model: red for the MR component, blue for the MP, and black for the sum of the two components as indicated in the legend. Bands indicate the 1σ confidence intervals. Panel b: projection of the stars in the υ_los vs [Fe/H] plane; the systemic velocity of Sextans is indicated with the horizontal line. The velocities have been corrected for the reflex motion between the Sun and Sextans.