sigma=0

sigma=0.000692521

sigma=0.00277008

sigma=0.00623269

sigma=0.0110803

sigma=0.017313

sigma=0.0249307

sigma=0.0339335

sigma=0.0443213

sigma=0.0560942

sigma=0.0692521

sigma=0.083795

sigma=0.099723

sigma=0.117036

sigma=0.135734

sigma=0.155817

sigma=0.177285

sigma=0.200139

sigma=0.224377

sigma=0.25