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+//Example 9// Ch 4
+clc;
+clear;
+close;
+// given data
+E = 1596; //in V/m
+p = 0.133; //in kPa
+a = E/p; // in V/m kPa kept constant as in example 8
+alpha1 = 39.8;//from example 8
+z = 0.0363; //from example 8
+d = (1/alpha1)*[log(1/z + 1)];//distance at the transition to a self-sustained discharge 
+printf("distance at the transition to a self-sustained discharge %f m",d)
+V = E*d;//voltage at the transition to a self sustained discharge
+printf("Voltage at the transition to a self sustained discharge %f V",V)