Phase-folded light curves of G 9–40 b. Top row: transits observed with K2 (left) and ARCTIC (right). Second row: transits observed with MuSCAT2 in r-band (left) and i-band (right). Third row: transits observed with MuSCAT2 in z_s-band (left) and TESS Sector 44 (right). Bottom row: transits observed with TESS in Sectors 45 (left) and 46 (right). In all panels, the black lines and shaded areas indicate the detrended best fit model from Sect. 4.3 and its 1σ confidence interval, respectively. Below each panel, the residuals after the subtraction of the median best fit model are shown. Blue diamonds show binned points to improve visualization.