Equation Icon  √--- √ --- √ --- √--- ˆEb1(t) = − R1 Eˆa1(t + 2x1∕c) + T1Eˆe1(t), ˆEb2(t) = − R2 ˆEa2(t + 2x2∕c) + T2 ˆEe2(t), ˆE (t) = √R--Eˆ (t − 2x ∕c) + √T-Eˆ (t), ˆE (t) = √R--ˆE (t − 2x ∕c) + √T--ˆE (t),(274 ) f1 1 e1 1 1 a1 f2 2 a2 2 2 e2 ˆEe1(t) = ˆEf2(t − L∕c), ˆEe2(t) = Eˆf1 (t − L ∕c).