Converting these equations to have j e equation in terms of electric field e e and ∇ T and q equation with j e and ∇ T, (using scalar coefficients for isotropic transport, α ee, α et, α te, and α tt instead of A ee, A et, A te, and A tt) j e = α α e e e e − − α α e t T 2 ∇ ∇ T ( e e = α α e e − − 1 j e + α α e e − − 1 α α e t T 2 ∇ ∇ T ) , q = α α t e α α e e − − 1 j e − − α α t t − − α α t e α α e e − − 1 α α e t T 2 ∇ ∇ T .