Very high energy outburst of Markarian 501 in May 2009

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Fig. 9

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VHE Photon index vs. flux normalization (F₀) obtained from the power-law fits of Fig. 8 for the different periods of activity as defined in Table 2. A linear fit was done to all the data, obtaining a χ² of 8.2 with a p-value of 0.09.

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