PION modeling of the spectra of NGC 5548 with n_H = 10¹⁰ m^-3 (left panels) and 10¹⁹ m^-3 (right panels). The spectral bin sizes are 0.025 Å (for LEG) and 0.01 Å (for MEG), respectively. The overall C statistics is 5146.0 (d.o.f. = 4843) at low density and 5158.9 (d.o.f. = 4842) at high density. The density sensitive metastable absorption lines of Fe xxii (B-like) and Fe xxi (C-like), from component F, are labeled with ∗.