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AR ERO = (6,28 x AR PISA R² x AR Alias V) : AR Vmax

AR Vmax: CW, Apical 5C view or Apical 3C view.
AR PISA R: CD, Apical 5C view or Apical 3C view.
AR Alias V: CD, Apical 5C view or Apical 3C view.