Posterior TTVs of GJ 3090 b from the photodynamical modelling (blue) compared with the with individual transit time determinations (black error bars). Top panel: One thousand random draws from the posterior distribution are shown. To compute the TTVs, we used a different linear ephemeris for each posterior sample and the period and time of conjunction from Sect. 4.2 for the individual transit time determinations. Lower panel: The 68.3%, and 95.4% CIs are plotted in different intensities of blue.