Reduced differences χ2/m (left) and Δ2/m (right) between the observed ionic column densities and the model results (see Eqs. (7) and (8)) for different values of the ionization parameter ξtot and computation mode. The top panels denote the cold, and the bottom panels the hot solutions. The computations of χ2 and Δ2 include the ions Ne VII–X and Fe IX–XXVI (green solid line) and only Fe IX–XXVI (blue dashed line).
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