In each panel, the symbols and solid lines show examples of hard X-ray photon count spectra of integrated spike flux from the Gaussian fitting, in comparison with the count rates spectra of underlying components. Solid lines show the least-squares fit of the spectra to a power-law distribution, and the exponents and their uncertainties from the fit are noted in the figures. The y-axis gives the units of the spike intensities, and the intensities of the underlying component are divided by four for clarity. The three panels from top to bottom illustrate the count spectra for spikes S1, S5, and S8, respectively, and the underlying components.