IllustrisTNG sSFR_log(τ) true values versus the median value recovered by BESTA. Coloured maps denote the number of sources in each bin. Bottom to top red lines of every panel correspond to the running 5, 50, and 95 percentiles of sSFR_log(τ) as a function of the true value. Dashed and dotted black lines illustrate the one-to-one and 0.5 dex offset lines, respectively. Each panel includes at the top-right corner the fraction of sources whose true value lies within the 68 and 90% estimated credible intervals, respectively.