Choose h angular momentum l : 

Choose multipoles: El+ El- Ml+ Ml-

Model input (on and off):
Background: Born  r (770) w(783)
Resonances:  S11(1535)  S11(1650)  P11(1710) P13(1720)
D13(1520)  D13(1700)  D15(1675) F15(1680)

Vector meson exchange: r and w poles r and w Regge trajectories 
Choose kinematical variables:

choose values for W, step size and maximum value:
W (MeV)
upper value

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