b 2 h ho b h, ∑2 2 2, 0 1 h b a n h − = = =       = + + 2 2 1 2 1 0 1 0 0 h T T h f a 2 2 2 2 2 , b a n h − = =       − = +  + = 2 0 3 1 2 0 2 1 2 2 1 2 2 1 h i f a h T T i