get1PortModel

      get1PortModel   returns 3 error terms from 1 port calibration
         E = get1PortModel(G,Gm)
         inputs:
            G,Gm: [3,num_pts] listed and measured S-parameters for reflection
                  Calibration standards G and Gm must have standards listed
                  in the same order
         output:
            E: [3,num_pts] columns are solution to the matrix equation Ax=b,
               where A and b are defined by the system of equations for the 1 port model
               E(1,:) = e00
               E(2,:) = e11
               E(3,:) = e00.*e11-e10e01 = delta_e