Exceptional X-ray activity in BL Lacertae | Astronomy & Astrophysics (A&A)

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Fig. 9.

Spectral variations during the observation period. Each spectrum is derived for the interval defined in Fig. 2. Two spectral models, namely a logparabola and double power law, as well as data points are shown in each plot. The spectral parameters of each plot are given in Table 2.

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