(a) Histograms of decay time t_decay of the single component (green), shorter decay time in double components (blue), and longer decay time in double components (red). (b) Histograms of peak intensity I_pk of the single component (green), shorter decay-time component in double components (blue), and longer decay-time component in double components (red). (c) Histogram of the ratio between peak intensity of the shorter decay-time component and peak intensity of longer decay-time component in double components.