correctPortExt

      correctPortExt    Performs correction of S-parameter data from the port-extension model.
          S_dut = correctPortExt(S_ext_dut,e10e01, port_num)
          input:
              S_ext_dut: [2,2,num_pts] uncorrected S-parameter data
              e10e01: [num_pts] Transmission tracking coefficients of the error model
              port_num: (1 or 2) port at which the adaptor is connected to
          output:
             S_dut: [2,2,num_pts] corrected S-Parameter data
                        e10       __________
            Port    o---->----o--|          |--o
         (port_num)     e01      |   DUT    |
                    o----<----o--|__________|--o