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| Climatic trends in E-region critical frequency and virtual height above Tromsø (70 degrees N, 10 degrees E) | 380 |
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| Climatic trends in E-region critical frequency and virtual height above Tromsø (70 degrees N, 10 degrees E) | 11 | 10 | 12 | 10 | 3 | 0 | 4 |
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