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| 6. Normal Ground Pattern | 7. Expanded Ground Pattern | 8. Expanded Ground Pattern |
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Figure 11 is a diagram. |
| 9. Radial Echo Pattern | 10. Radial Echo Pattern |
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| 12. Elevated Refracting Layer | 13a. Super-refractive Layer | 13b. Super-refractive Layer |
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| 13c. Super-refractive Layer | 13d. Super-refractive Layer | 13e. Super-refractive Layer |