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Graphics Interchange Format  |  1996-06-30  |  6MB  |  3112x2208
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OCR: dB uV/m 120 108 100 500 600m 300 (1000 200 (1500 150 (2000 60 (5000 (10000 (20000 (30000 MHz 30m 60 (100 150 (200 300 20 100 1000 10000 km FIGURE Ground-wave propagation curves Sea, mho/m 80 FIGUR