For a 4 x 4 matrix \(M\isin M_4(\mathbb{C})\), let M denote the matrix obtained from M by replacing each entry of M by its complex conjugate. Consider the real vector space H = \(\{M\isin M_4(\mathbb{C}):M^T=\overline M\) where MT denotes the transpose of M. The dimension of H as a vector space over \(\R\) is equal to