Histogram of the number of events detected in our observation window, under the assumptions that they share the properties of the uones detected in Rappaport et al. (2019a). From the number of times no events were detected, we estimate the probability of having missed all events in our data set due to our limited observing time to be 4.8%. In this plot, only the K2 features with depths larger than 150 ppm and durations longer than 1.5 h have been considered.