... nuclei

Based on public observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and the USA (NASA).

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...

Appendices are only available in electronic form at http://www.edpsciences.org

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...GLAST

http://www-glast.stanford.edu

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...AGILE

http://agile.iasf-milano.inaf.it

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... Archive

http://xmm.vilspa.esa.es/external/xmm_data_acc/xsa/index.shtml

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... boresight

This maximum distance has been selected to take into account that within that region the telescope vignetting is well corrected according to Kirsch (2005).

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... source

This is the case of Mkn 421, 3C 273, and PKS 2155-304, that are calibration sources. For the purposes of the present work, only the pointings with the PN detector in small window mode were used.

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