Variations in spectral parameters with pulse phase. The left axes exhibit the spectral parameter evolution with pulse phase, while the right axes show the pulse profiles of NuSTAR in the 4–79 keV range. The parameters shown are: N_H – hydrogen column density from the pcfabs component (×10²² cm⁻²), representing intrinsic absorption; covering fraction – fraction of the source covered by absorbing material; E_cut – cutoff energy in the highecut component (keV); E_fold – e-folding energy in the highecut component (keV); Γ – photon index of the power-law component; PD – polarization degree; PA – polarization angle; E_cyc – CRSF centroid energy (keV); σ_cyc – width of the CRSF line (keV); line depth – optical depth of the CRSF; E_gauss – centroid energy of the iron fluorescence line (keV); EW_gauss – equivalent width of the iron line (keV); Norm_gauss – normalization of the iron line component.