... =)*+(, ,,,,,, = /!"#$ 12 (7L@T =)*+(, σ=/!"#$ 12 (72(8L@T =)*+(, ... #B@Dã03/?@)E,@@"3,*+,,3&3;+,/@/nVF/L5+A+K>,+A>D3&3&345/&C5+A,5&LUA*+,/T:30A0#B}Q:-Q& 12 ( ),9:9;<9;9 G;<A(),;<99;9&,MA:30A0#B#T1LJbT44QFz ... !"#$%"&'"!(&)$!*+ , = − + − − − + −12TWW]UVgiVgxx*+Tmd,cW][Wb- .! . "!(& ) /!01"...