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Figure 2: Modulus of the electric field without the term 1/ 1 ( in the plane z = L/2 for modes close to the 14 GHz frequency for 1 W of the incoming wave power. For each mode the maximum field value is estimated after an equal time interval, supposed large enough to neglect the second-order terms. The white normal axes indicate the mode rotation caused by the coupling with the rectangular waveguide.