Top: best fit temperature parameters for the one-component VNEI model (kT) in regions in which the F-test indicated that the one-component model fits the spectrum sufficiently well (left) and temperature parameters kT₁ and kT₂ for the two-component fits for all regions (middle and right, respectively). Middle: best fit values for the ionisation timescale τ for the one-component VNEI model (left) and the ionisation timescale τ₂ for the dominating ejecta component for the two-component fits (right). Bottom: best fit values for the foreground N_H for the one-component VNEI model (left) and for the two-component fits (right). The crosses mark the regions in which the F-test indicated that the two-VNEI component model yields a better fit (see Sect. 2.2.3).