... WebPIMMS

http://heasarc.gsfc.nasa.gov/Tools/w3pimms.html

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... Handbook

http://xmm.vilspa.esa.es/external/xmm_user_support/documentation/uhb_2.1/XMM_UHB.html

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... (HEASARC W3nH

http://heasarc.gsfc.nasa.gov/cgi-bin/Tools/w3nh/w3nh.pl

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