\[\tfrac{1}{2}(f(u+)+f(u-))=\frac{1}{2\pi\mathrm{i}}\lim_{T\to\infty}\int^{%
\sigma+\mathrm{i}T}_{\sigma-\mathrm{i}T}u^{-s}\mathscr{M}\mskip-3.0muf\mskip 3%
.0mu\left(s\right)\,\mathrm{d}s.\]