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section{Previous \section{Previous  measurements} \citet{JIMMY13} measured the stellar kinematics and photometry of the galaxies in our sample, we summarise their method and results in this section.  %------------------------------------------------------------------------------------------------------------------------------------------------------------------ %-------------------------------------------------------------------------------------------------------------------  \subsection{Stellar Kinematics}\label{sec:ppxf}  First a signal-to-noise ratio (SNR) cut of 5 across all the spaxels (spatial pixels) was applied. The spaxels were then re-binned to a minimum SNR of 10, using the spatial binning Voronoi code of \citet{CAPPELLARI03}. The velocity and line-of-sight velocity dispersion were computed using the penalised fitting scheme of \citet[pPXF;][]{PPXF}, and the MILES \citep[Medium-resolution Isaac Newton Telescope Library of Empirical Spectra; ][]{MILES} library stellar templates. pPXF fits the stellar library templates to the absorption line features of the BCG spectra, giving the redshifts and the broadening of the spectral lines.  \\\\