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where the sagittal curvature 1 /Rs belongs to the sagittal plane, i.e. the dispersion plane (x, z) with 9 = 0 on x-axis (Rx = Rs) (Fig. 3.29).

The mean curvature 1/R allows us to represent the grating ellipsoidal shape by expanding the co-addition modes z20, z22, z40, of a sphere with a saddle. The grating shape

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