Difference between observed and true values of Δ(age) as a function of Δ(age)obs, color-coded according to the observed errors retrieved from PDFs. Galaxies are observed at z = 0.55 and S/NI, obs = [10, 20, 30] (from left to right). The black horizontal dashed line corresponds to the median value of Δ(age)obs − Δ(age)true, while the black solid line represents the trend of observed errors at various values of Δ(age)obs. The gray shaded area represents the region compatible with Δ(age)obs = 0.
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