s( λ )= dY( λ ) d X e ( λ ) MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaaiaadohadaqadaqaai abeU7aSbGaayjkaiaawMcaaiabg2da9maalaaabaGaaeizaiaadMfa daqadaqaaiabeU7aSbGaayjkaiaawMcaaaqaaiaadsgacaWGybWaaS baaSqaaiaabwgaaeqaaOWaaeWaaeaacqaH7oaBaiaawIcacaGLPaaa aaaaaa@45C0@