... (HESS)

http://www.mpi-hd.mpg.de/hfm/HESS/

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... direction

which is the case for $r_{\rm b} \leqslant r_g$.

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... observations

See http://www.asdc.asi.it/blazars/

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...Marconi et al. (2000)

The reddening correction was applied using the factors carried out by Marconi et al. (2000) themselves.

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... Tool

See http://www.asdc.asi.it

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