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Graphics Interchange Format  |  1996-06-30  |  6MB  |  3112x2194
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OCR: dB V/m 120 106 100 500 KHz (600m 300 (1000 200 (1500 10 (2000 (5000 (10000 (20000 10 30000 MHZ 30m (60 100 (150 (200 (300 700 42 100 1000 10000 km FIGURE Ground wave propagation curves: Earth 310 mho/m,