\[\mathscr{M}\mskip-3.0muh\mskip 3.0mu\left(z\right)=\mathscr{M}\mskip-3.0muh_{1%
}\mskip 3.0mu\left(z\right)+\mathscr{M}\mskip-3.0muh_{2}\mskip 3.0mu\left(z\right)\]