Synthetic image of β Lyr A for λ = 155 nm (OAO2 band). This model is based on a “nebula” with a vertical temperature jump, T(z) profile is determined by its scale height H and multiplication factor h _mul = 5.27, together with temperature inversion scale h _inv = 5.19 and factor t _inv = 4.87. The resulting total χ ² = 99430, with individual contributions as low as , , , , which is significantly better than the nominal nebula model presented in Table 9. However, the artifacts (bright spots close to the outer rim; black in this color scale) are clearly visible.