Panel a: flare lightcurve (black, solid) for low-energy-band data (0.2–1.0 keV). Panel b: flare lightcurve (black, solid) for high-energy-band data (1.0–12.0 keV). Also plotted in both panels are fits to the lightcurves consisting of the sum of an exponential decay term and a decaying sinusoid. The red, dashed line shows the fit when the decay of the sinusoid was described by an exponential, while the blue, dot-dashed curved shows the fit when the decay of the sinusoid was described by a Gaussian. We note that the blue and red curves are almost identical and, therefore, difficult to distinguish. The vertical dotted line highlights t = 0 min, which was determined from the total energy band.