| 1. | The gaps in each ring face each other, in the unit cell.
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| 2. | The unit cells are stacked in three-dimensional space to form the crystal.
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| 3. | It forms triclinic crystals with two of the formula per unit cell.
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| 4. | And obtained by summing over all atoms X of the unit cell.
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| 5. | The unit cell represents the simplest repeating unit of the crystal structure.
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| 6. | The unit cell contains two small cages and six large ones.
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| 7. | While peak positions are constrained by the unit cell parameters, intensities are unconstrained.
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| 8. | Figure 3 shows a unit cell of ruby in this style.
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| 9. | From the unit cell the crystal structure can be fully reconstructed via translations.
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| 10. | Figure 4 shows a unit cell of ruby in this style.
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