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Fig. 5


Relation of the optical and BAT intensities during the series of outbursts of GK Per. The points of a given outburst are connected by the lines to show the time evolution (only the data with IBAT> 0.003 ct cm-2 s-1). Inset shows the remarkable points of these outbursts. See Sect. 3 for details. (This figure is available in color in electronic form.)

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