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Figure 2
(a) A representation of the ice II structure viewed down the c axis of the non-primitive hexagonal cell. Observe that the structure consists of a `sheaf' of hexagonal columns (shaded grey) parallel to the c axis. (b) A representation of the ice II structure viewed perpendicular to the c axis of the non-primitive hexagonal cell, showing the lateral bonding of 6A and 6B rings to join the hexagonal columns (shaded grey) together.

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