SABR Model keys
ATM Calibrated
Alpha Guess
Alpha fixed
Alphas Guess
Backward Flat
Beta Guess
Beta fixed
Betas Guess
Cut off Strike
Error Accept
Error Tolerance
Is Array
Max Guesses
Nu Guess
Nu fixed
Nus Guess
Optimization
Rho Guess
Rho fixed
Rhos Guess
Use Max Error
Vega Weighted
