Initial values of parameters: 
         ap =      6.00000E-02
         ao =     0.927000
       xorg =      5.00000E-02
 
 objective function =   0.177166238427    
 
 Final values of parameters: 
    ap (estimated)  =      9.75884E-02
    ao (estimated)  =     0.918401
    xorg            =      5.00000E-02
 xo=(1. - ao)*xorg  =      4.07996E-03