Long-term X-ray spectral evolution of ultraluminous X-ray sources: implications on the accretion flow geometry and the nature of the accretor

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Fig. 10.

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Left: as for Fig. 7 but for M 83 ULX1 for the hard diskbb. Right: as for Fig. 8 but for the countours around the best-fit T_hard and its normalisation for three selected epochs of M 83 ULX1. The degeneracy between these two parameters can be ruled out as the cause of the positive L–T correlation.

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