Fig. 2.
Time histories of the two hardness ratios, (M + H)/L (green) and M/H (purple), with ±1σ error bars. The former is halved for presentation. The cyan curve superposed on the latter shows the result of 3-bin running average. (Color online)

Time histories of the two hardness ratios, (M + H)/L (green) and M/H (purple), with ±1σ error bars. The former is halved for presentation. The cyan curve superposed on the latter shows the result of 3-bin running average. (Color online)

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