Transit light curve of V1298 Tau c observed using HST/WFC G141. Upper panel: raw white (1.12-1.65µm band) light curve for the transit of V1298 Tau c. Blue and green points show forward and reverse scanned exposures, respectively. The solid black lines show the best-fit transit model. We used a physically motivated charge trapping model, RECTE (Zhou et al. 2017, 2020) to fit the exponential ramps. The baseline was modeled using a quadratic function in time. See Appendix C for further discussion. The transit was modeled using batman (Kreidberg 2015). For details of light curve fitting, see Sect. 2. Lower panel: residuals from the fit to the white light curve observations.