Phase-averaged photon spectra for the neutron star model with kT_p1 = kT_p2 = 0.15 keV, B_p1 = B_p2 = 6 × 10¹³ G, z = 0.2, i = θ_B = 90° and different temperature distributions across the surface. Top panel: the temperature distribution Eq. (23) with a₁ = a₂ =  0.25 (dotted curve), with a₁ = a₂ = 60 (dashed curve), and two uniform bright spots with T = T_p and angular size θ_sp = 5° (solid curve). The local spectra are isotropic black-body spectra with an absorption line (τ₁ = 3, σ₁ = 30 eV) centered according to Eq. (26). The spectrum of the model with a = 0.25 and a weaker absorption line (τ₁ = 2.6, σ₁ = 6 eV) is also shown (dash-dotted curve). The thin solid curves are the continuum spectrum of a model with a = 60 and a single black-body spectrum with a Gaussian line (E₁ = 0.25 keV, τ₁ = 0.85, σ₁ = 52 eV) for the strong-line a = 0.25 model. Bottom panel: the photon spectra for two temperature distributions (a = 0.25 and two bright spots) under various inclination angles to the line of sight: i = 0° (solid curves), i = 45° (dashed curves), and i = 90° (dotted curves).