Equation Icon  ˆ ˆ ˆa = ˆaN-√±-ˆaE , ˆb = bN-±√--bE, ˆe = ˆeN-±√--ˆeE, ˆg = ˆgN√±-ˆgE-. (331 ) ± 2 ± 2 ± 2 ± 2