Equation Icon  ˆ 1-ˆy ˆy Ωx j,k+1∕2,l+1∕2 = 4[Fj,k+1∕2,l + Fj,k+1∕2,l+1 ˆz ˆz − F j,k,l+1∕2 − F j,k+1,l+1∕2], (102 )