Location of stars along the line-of-sight to Sextans from the spectroscopic samples of W09 and B11. Left: colour-coded using the updated membership probabilities from this work. The colour-coding is as in W09, with black, red, magenta, green, cyan and blue markers denoting P_i≥ 0.00, >0.01, >0.50, >0.68, >0.95, >0.99 respectively. Right: colour-coded using the difference in the membership probabilities here derived and in the previous works (ΔProb. = P_new−P_prev). Black ellipses show the nominal King tidal radius with parameters from this work. For these plots, in the case of the overlapping stars we opt to use the probabilities derived from the dataset of B11, as when evaluating their probabilities we can rely on three spectroscopic sources of information (v_hel, EW Mg and [Fe/H]), rather than two as in the case of the W09 dataset (v_hel and ΣMg). Further, we consider that the metallicity is a more reliable discriminant compared to just the Mg-triplet absorption feature from W09, as it depends on three parameters measured by B11: EW Mg of the star and apparent magnitudes in V band of both the star and the horizontal branch of the galaxy.