Fig. 12
Hard-to-soft compactness ratio lh/ls vs. hard compactness ls. The figure is extracted from Ghisellini & Haardt (1994). It shows the one-to-one correspondence between the spectral characteristics of the Compton spectrum of a pure pair plasma (energy spectral index α and temperature kT) and the soft and hard compactnesses.The black points correspond to the 10 observations of Mrk 509.
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