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Fig. 7


Equivalent hydrogen column densities calculated using Phabs and APEC (PA) versus Wabs and MEKAL (WM) models. Solid lines indicate equality. Upper panel: for both PA and WM, abundances by Anders & Grevesse (1989) are adopted. Lower panel: for PA, abundances by Asplund et al. (2009) are adopted, and for WM by Anders & Grevesse (1989). The dashed grey line is intended as a guide to the eye and corresponds to 1.33·NH (WM).

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