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Measured angles of incidence for the intensity maximum position in the Littrow mounting of the R4 grating plotted as a function of λ2. The central point is estimated from Fig. 2 of Ref. 1 for λ = 546.1 nm. The plot indicates a linear dependence of the maximum intensity position on λ2. The line drawn through the points intersects with the ordinate for λ = 0 at
(A) Groove profile of the R4 grating and the mounting used to measure the blaze angle. When
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