SABR parameters calibrated from market data:
maturity|alpha            |beta |rho              |sigma0
0.25    |0.542570769932   |0.5  |0.372158471968   |0.0639088550279
0.5     |0.461076583099   |0.5  |0.310862076569   |0.0618846387624
1.0     |0.407592004304   |0.5  |0.240437202933   |0.0587186921049
2.0     |0.336346964925   |0.5  |0.187521430279   |0.0562744663714
3.0     |0.353132113609   |0.5  |0.101647191578   |0.0521130271671
5.0     |0.349231404683   |0.5  |-0.0145283245288 |0.0472079170493