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Table 2

X-ray spectral model for the 2005 and 2007 Chandra data.

Model NH Normalization Γ or kT C/d.o.f.

PL 3 145.5/1050
BB 3 141/1050

NSA 3 <3.8 140.8/1050

Notes. The errors correspond to 68% confidence intervals. NH is kept frozen during the fit and is given in units of 1020 cm-2. The power-law normalization is in units of erg cm-2 s-1 at 1 keV. The neutron star atmosphere model normalization is in units of 106m2 and refers to a 90% confidence level upper limit.

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