Zoom on the track of Kepler-128 c in a river diagram with a folding period of 22.8030 days. The left panel shows the detrended data with a clipping at 3σ. The right panel shows the corresponding confidence matrix which is the output of the RIVERS.deep algorithm. Black indicates noise or missing data; white indicates the track of a planet. The track having the highest confidence is highlighted in blue. For comparison, the transit timings reported by Rowe et al. (2015) are shown in red. See Fig. 4 for further comparisons.