Posterior TTVs of CoRoT-20b from the photodynamical modeling of the system. One thousand random draws from the posterior distribution are used to estimate the TTVs after the subtraction of linear ephemerides for each posterior sample. Thethree different gray regions represent the 68.3%, 95.5%, and 99.7% credible intervals, the white line is the median value of the distribution, and the red line correspond to the TTVs of the maximum a posteriori model. The TTV amplitude is shown versus the CoRoT-20 b epoch number (0 is the first transit observed by CoRoT), up to the end of 2020.