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The apparatus as described in \cite{arron_Meyer_Pauwels_Lecoq_2012} is altered in several respects as shown in \ref{fig:actualsetup}. Firstly the right photodetector is placed within a 3D-printed clamp, shown in figure \ref{fig:actualsetup}, designed to hold the scintillator crystal vertically with respect to the reference detector. Secondly the Na22 source is moved to a 5mm separation distance from the scintillator crystal under investigation. As in the standard apparatus both scintillator crystals are coupled to the Hamamatsu MPPC S10931-050P SiPM photodetectors using Rhorosil 47A optical grease.   \subsection{Reference Coincidence Measurements}  The reference scintillator crystal, shown on the left of \ref{fig:actualsetup}, is a 2×2×5mm3 Ca-co-doped LSO:Ce wrapping in PTFE tape coupled. Using two identical such crystals the coincidence time resolution was determined using the standard coincidence apparatus, values shown in table \ref{tab:referencevals}. This value is agreement with prior measurement\cite{arron_Meyer_Pauwels_Lecoq_2012}.\begin{table}   \caption{\label{tab:referencevals} Coincidence time resolution values for $2\times2\times20$ Ca-co-doped LSO:Ce wrapping in PTFE tape for standard and DOI measurements. DOI measurement was repeated twice.}   \begin{tabular}{llr}   \hline   CTR (ps) & DOI Measurement? & $\chi_\text{Reduced}$ \\   \hline   131$\pm$4 & False & 0.398849 \\   132.0$\pm$2.9 & True & 1.289315 \\   137$\pm$6 & True & 0.590516 \\   \hline   \end{tabular}