Depiction of persistence effects in the L168-9b data. Upper part: Full light curves. Bottom part: zoom into the beginning of the light curves up to half an hour. Top left panel: rectangular selection of nine pixels located in the spectral trace, at the highest flux levels. Top right panel: corresponding time series. Persistence effects are visible at the beginning of each time series for less than approximately 30 min. Bottom left panel: selection of pixels located in the background. All pixels display a really low but yet similar amount of flux between 30 and 50 DN s⁻¹. Bottom right panel: corresponding time series in which no persistence effect is visible for these pixels.