Best fit of the averaged spectrum using three magnetized neutron star model spectra. (1) Covered by a hydrogen atmosphere (atm (pure)). (2) covered by an emitting condensed surface (CS (pure)). (3) Covered by an emitting condensed surface with an additional hot spot covered with a geometrically thin atmosphere (CS + atm; Σ = 10 g cm⁻²). See the detailed description in the text. The separate contributions of the components (CS (atm) and atm (CS)) are also shown. The deviations of each model from the observed spectrum are shown separately in the three bottom panels.