Photometric data of planets b) (top, left), d) (top, right), and e) (bottom). Each transit is centred relative to a linear ephemeris. Small dots represents the photometric data, whereas circles represent the data binned. Each panel is labelled with the epoch, with zero the first transit after t_ref. The black curve is the median value of the distribution of oversampled models corresponding to 1000 random MCMC steps, the different shades of grey represent the 68.3, 95.5, and 99.7% confidence intervals. In the lower part of each panel the residuals after subtracting the MAP model to the observed data are shown.