Spike detection algorithm using the three methods (see text) for the event on 2002 August 3. Left panels show the demodulated light curves at 25−100 keV, the slow-varying component (smooth) determined by the three methods, and the residuals (bottom of each panel). The smoothed lines (bottom of each panel) show the sigma levels using the three methods. Right panels show the times (x-axis) and energies (y-axis) of significant residuals recognized by the algorithms. The numbers 1 to 7 along the y-axis indicate energy bands of 10−15, 15−25, 25−40, 40−60, 60−100, 100−300, and 25−100 keV, respectively. The vertical line indicates the most pronounced spikes of the diagrams.