L e,λ ( λ,T )= c 1 π λ −5 e − c 2 λT MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaaiaadYeadaWgaaWcbaGaaeyzaiaabYcacqaH7oaBaeqaaOWaaeWaaeaacqaH7oaBcaqGSaGaamivaaGaayjkaiaawMcaaiabg2da9maalaaabaGaam4yamaaBaaaleaacaaIXaaabeaaaOqaaGWaaiab=b8aWbaacqaH7oaBdaahaaWcbeqaaiabgkHiTiaaiwdaaaGccaqGLbWaaWbaaSqabeaacqGHsisldaWcbaadbaGaam4yamaaBaaajiaibaGaaGOmaaadbeaaaeaacqaH7oaBcaWGubaaaaaaaaa@4D58@