Energy spectra for several time intervals defined in Fig. 1, shown in two panels (a) and (b) for clarity. Open circles and squares represent STEP and EPT measurements, respectively. The spectrum for the ∼5-minute interval immediately downstream of the IP shock is displayed as the dashed line in panel (a). The spectra in panel (b) are vertically shifted for clarity. The horizontal black bars at the top indicate the energy ranges covered by STEP and EPT. Other horizontal bars mark the spectral peaks in corresponding colors. The scale bar at the bottom of panel (b) indicates an energy ratio of 4 as a reference.