Equation Icon  1 ( ( z (t)) ( z (t)) ) h(t) = -- ˆnT2 ⋅ ˆH t −-d--- ⋅ ˆn2 − ˆnT3 ⋅ ˆH t −-d--- ⋅ ˆn3 , (27 ) 2 c c