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Fig. 2

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The dashed (blue) curve is the energy emitted in the extended afterglow, the solid (red) curve is the energy emitted in the P-GRB, their sum is . From left to right, the first vertical line corresponds to the value of B = 1.0 × 10-4 of scenario 1, the second to the value of B = 6.0 × 10-4 of scenario 2 (see Sect. 3).

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