TTVs for Kepler-1972 b (top) and Kepler-1972 c (bottom). The black error bars represent the TTVs coming from the RIVERS.deep method which is the network’s highest confidence for the timing of each transit (highlighted pixels in Fig. 1). These timings are used as TTV proxies to initialise the photodynamical fit close to its final solution, but are not transit timings fitted to the data. Their error bars indicate the sensitivity of the method (30 min). We show 300 samples resulting from the photodynamic fit of the light curve in grey, and the solid coloured curves correspond to the best fit.