Fig. A.4.
Comparison between uncertainties on velocity dispersions, due to propagation of uncertainties on individual observables (solid lines, see Appendix A for details) and those estimated by bootstrapping technique (dashed lines, see Sect. 3.1 for details). The uncertainties are shown as a function of [Fe/H] (top panel) and as a function of [Mg/Fe] (bottom panel).
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