+ 6h 44m - definite 2- and 3-hop obliques + Th +h +h +8h 15m 18m 45m 15m ~ very pronounced very pronounced very pronounced effect tapering still present 2-hop obliques 2 and 3+hop obliques 2- and 3-hop obliques continue off, but 2= and 3-hop obliques +8h 18m = normal except for M- and N-type echoes (combinations of Es and Felayer reflections). xm! 800 600 } 400 200 *7ThiSm +OniSm¢ 800 €00 "400 200 +8hiom +7h 16m x" 800 600 400 200 t 2 3 4 6 8 10 ta uc 2 3 4 6 a 10 4 uc Fig. 3.31 - Ionospheric Records at Maui Following Shot 1, Showing Definite Effects 2 SECRET

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