... South

Table 1 and Appendices A-C are only available in electronic form at http://www.edpsciences.org

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... correction

See http://asc.harvard.edu/ciao/threads/acistimegain/

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... files

See http://heasarc.gsfc.nasa.gov/docs/xanadu/xspec/manual/node57.html

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... band

Given the low background of Chandra and the small extraction regions used for the sources, the correlation between signal-to-noise in a given band and total net counts is very tight. Therefore for simplicity we select our sources on the basis of the net detected counts.

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... 2003)

See http://cxc.harvard.edu/ccw/proceedings/03_proc/presentations/marshall2

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