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New address (since September 2006): Integral Science Data Centre, Ch. d'Ecogia 16, 1290 Versoix, Switzerland and Geneva Observatory, University of Geneva, Ch. des Maillettes 51, 1290 Sauverny, Switzerland.

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... setups

see XMM-Newton User's Handbook (http://xmm.vilspa.esa.es/)

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... tools

http://cxc.harvard.edu/ciao/guides/hrc_data.html

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... declination

The 90% source location error circle in Chandra has a radius of about 0.5 $^{\prime\prime}$, see Chandra Proposers' Observatory Guide v.8.

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... software

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

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... data

We confirmed these estimates using Monte Carlo simulations based on the observed source spectrum, the observed background spectrum, the same response matrix and exposure time, and the thermal structure and abundances as found in our best fit to the entrire spectrum; we obtained an 68% limit at 2 $\times$ 10¹⁰ cm^-3 and a 90% limit around $\approx$9 $\times$ 10¹⁰ cm^-3. Conversely, if the true density were 10¹¹ cm^-3, we found that only one out of ten statistical realizations converges to an inferred density below $\approx$2 $\times$ 10¹⁰ cm^-3.

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