Dependence of the CRSF centroid energy E_CRSF (panel a) and width σ_CRSF (panel b) on luminosity and viewing angle θ (measured with respect to the magnetic axis). Results are shown for five angular bins spanning the range θ ∈ (0, π/2), with E_c = 25.55 keV. Solid black lines denote quantities extracted from angle-averaged spectra. Both E_CRSF and σ_CRSF exhibit a positive correlation with luminosity for all viewing angles. At a fixed luminosity, E_CRSF (σ_CRSF) decreases (increases) toward smaller viewing angles, indicating substantial variability over the pulse cycle.