$Z^{\mbox{\footnotesize{RI$^\prime$}}}_\psi$ is the quark wave function renormalization constant in the RI${}^\prime$ scheme which is given in [@27; @28]. The reason why the value in the original RI${}^\prime$ scheme is used has been discussed in [@33; @34; @35]. In determining the final renormalization constant $Z^{\mbox{\footnotesize{RI$^\prime$/SMOM}}}_{\cal O}$, we follow the procedure of [@42] for automatic Feynman diagram computations. In other words we compute all diagrams in terms of their bare quantities which here are essentially the coupling constant and the gauge parameter. Then the renormalized parameters are introduced by rescaling with the already determined coupling constant and gauge parameter renormalization constants. Although the latter should be taken to be in the RI${}^\prime$ scheme to the one loop order we are working any scheme effect will not show up until two loops. Whilst this is a standard procedure for introducing counterterms, the main issue here is that this rescaling from bare to renormalized quantities must also include the mixing of the operators. Therefore, in constructing our amplitudes, which are recorded in sections three and four, the matrices (\[mat2\]) and (\[mat3\]) have been included. In practical terms this means that the renormalization constants are found by first fixing those in the last row of 