Figure 1: Ramp-step functions (composed of three linear phases) are used as templates for the change profile. The parameters are the start of the change t 0 and the rise time rt as well as the change amplitude α. The end of the analysed segment of the time series is determined by the alarm time t a . The step change is the case rt = 1 and the ramp change is rt ≥ t a - t 0 .