TOTAL RADIO PATH ABSORPTION 



285 



CD 20 



CD I 



500 700 1000 



2000 5000 7000 10000 



FREQUENCY (MC/S) 



20000 



50000 70000 100000 



Figure 7.12. Total path absorption over a 1000 km propagation path with the climate 



of Bismarck, N. Dak. 



