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diff --git a/3739/CH4/EX4.6/EX4_6.sce b/3739/CH4/EX4.6/EX4_6.sce
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+//Chapter 4, Example 4.6, page 142
+clc
+
+//Initialisation
+d=200                            //height in Km
+f=700                            //frequency in Khz
+
+//Calculation
+T1e=0.4                          //from graph 4.10
+T2e=0.9
+T3e=1.7
+T1f=1.3
+T2f=2.8
+T3f=4.3
+Tef=0.3
+Tef1=2.7
+Tef2=0.5
+
+//Results
+printf("(1) Time delay of E layer, Td(1E) = %.1f ms",T1e)
+printf("\n                           Td(2E) = %.1f ms",T2e)
+printf("\n                           Td(2E) = %.1f ms",T3e)
+printf("\n    Time delay of F layer, Td(1F) = %.1f ms",T1f)
+printf("\n                           Td(2F) = %.1f ms",T2f)
+printf("\n                           Td(2F) = %.1f ms",T3f)
+printf("\n(2) Time delay of E and F for a distance of 500 km, Td(E,F) = %.1f ms",Tef)
+printf("\n(3) Td(1F,3F) = %.1f ms",Tef1)
+printf("\n    Td(1E,3E) = %.1f ms",Tef2)