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Fig. 11

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The combined XLFs of field sources with (open circles) and without (filled circles) transient sources in M 31. LX is the unabsorbed X-ray luminosity in 0.5–8 keV. Due to multiple short observations averaging the luminosities of transients (which are bright in only a few observations and faint in many others) the number of faint sources is artificially increased, making the XLF appear steeper. See text for details.

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