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+//Chapter 3, Example 3.6, page 76
+clc
+//Initialisation
+dn=-0.2                               //air refractivity gradient
+d=20                                  //height
+b=0.074                               //elevation angle from graph 3.10
+f=7                                   //frequency in Ghz from graph 3.11
+c=2*10**-6
+
+///Calculation
+t=0.156                                //1000/6370
+dm=dn+t
+a=(-c*dm*d)**0.5                     //elevation angle of waves
+
+//Results
+printf("Elevation angle of waves = %.2f mrad",(a*10**3))
+printf("\nElevation angle = %.3f",b)                                    //from graph 3.10
+printf("\nMinimum frequency of coupling waves into the duct = %d Ghz",f)     //from graph 3.11