LHS 1140 b NIRISS/SOSS white light curves for each of the four visits. White light curves are constructed using the first SOSS spectral order (0.85–2.85 μm). Data are shown in colored points and best-fitting transit models in black. The lower panels in each quadrant shows the residuals to the best-fitting model. A serendipitous double transit of planet c can be seen during the second visit. Gray points in Visit 4 show timestamps that were excluded from the fit due to the potential presence of a flare.