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Fig. 9. Diagram of two types of corneal nipples, with parabolic and sinusoidal
cross-section. The corneal nipples are spaced at a distance of d=220
nm, and they have a height h=250 nm. The paraboloid is chosen so that
the area at its base equals the area of the unit lattice cell, and has at the
base a radius
.
The radius of the sinusoid at the base is
r0=d/2=110 nm.