4. Type of Division Figure 14 shows the relations between the number of divisions, spherical aberration slope error, number of different radii allowed, etc. Based on this, the following parameters were chosen: number of segments, 9; differing number of radii, 3; and spherical aberration, 2.2 mrad; nine segments; three different radii; and a spherical aberration of 2.2 mrad.
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