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Radial, i.e. combined figure/alignment error δrmir(x, φ) on the left and slope error ∂xδrmir(x, φ) on the right along surface lines of constant φ, calculated using equation (8). The axial position xmir is measured relative to the geometrical centre of the mirror, whereas the angle φ refers to the polar orientation as defined in Fig. 2 ▸.
