Optics for X-ray telescopes: analytical treatment of the off-axis effective area of mirrors in optical modules

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Fig. 3

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The effective area at 30 keV (λ = 0.4 Å) of a Wolter-I mirror shell with R₀ = 148.5 mm, L = 300 mm, f = 10 m, α₀ = 0.212 deg, and a reflectivity product as shown in Fig. 2 (solid line). The effective area was used to re-derive the T_λ(α₁) function (Fig. 2, dots).

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