Fig. 9
Emission weighted column density (EWC) calculated from models A and B. The values derived by G09 from spectral fits to XMM-Newton spectra are also plotted (see Sect. 3.4.2), with the formal error bars attained from the spectral fitting. The plotted values do not include the column density due to the interstellar medium (2.5 × 1021cm-2).
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