Figure of merit as a function of the number of data points N for parametrization (4) (panel a)), parametrization (6) (panel b)), and parametrization (5) (panel c)) assuming σt = 10%. Solid squares correspond to the age simulated data only whereas solid circles stand for a joint analysis with the BAO data described in the text. Solid (dashed) red lines represent the FoM for the current observational t(z) (t(z) + BAO) data while solid (dashed) blue lines represent the FoM obtained from the Union2.1 compilation (SNe Ia + BAO).
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