O–C plot showing the deviations in transit time from the best-fit linear ephemeris from Guo et al. (2020) (grey dashed line) for HD 97658 b to have a direct comparison to the Maxted et al. (2022) bestfit linear and quadratic models (red dashed and green solid lines). Our best-fit models are shown as an orange dashed line for the linear model, and as a purple solid line for the quadratic model. The transit number is shown on the x-axis, and the difference in timing is shown on the y-axis. CHEOPS data are highlighted in black.