Fig. B.1.
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Diffuse emission spectrum of the central part of M82 in the 3.3-5 keV band. It illustrates the excess emission at 4.5 keV. The red histogram indicates the best fitting apec model, which describes the Ca feature at 3.9 keV. No strong atomic line feature that corresponds to the 4.5 keV emission is expected. The flux density is in units of 10−14 erg s−1 cm−2 keV−1.
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