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\begin{document}
  
   \centering
    \captionsetup[subfloat]{labelformat=empty}
    \subfloat[][{$[1.1,1.3]\, {\mathrm{\,Ge\kern -0.1em V\!/}c^2}\xspace$}]{$\begin{pmatrix}
0.30 & \phantom{+0.00} & \phantom{+0.09} & \phantom{+0.02}  \\
0.00 & 0.47            &             &   \\
0.09 & 0.02            & 0.68            &   \\
0.02 & 0.16            & 0.02            & 0.92 \\
    \end{pmatrix}$} \hspace{1cm}
    \subfloat[][{$[1.3,1.4]\, {\mathrm{\,Ge\kern -0.1em V\!/}c^2}\xspace$}]{$\begin{pmatrix}
0.41 & \phantom{+0.03} & \phantom{+0.12} & \phantom{+0.01}  \\
0.03 & 0.66            &             &    \\
0.12 & 0.07            & 0.93            &   \\
0.01 & 0.20            & 0.10            & 1.27  \\
    \end{pmatrix}$}\\
    \subfloat[][{$[1.4,1.6]\, {\mathrm{\,Ge\kern -0.1em V\!/}c^2}\xspace$}]{$\begin{pmatrix}
0.35 & \phantom{+0.01} & \phantom{+0.14} & \phantom{+0.00} \\
0.01 & 0.53            &             &  \\
0.14 & 0.05            & 0.76            &  \\
0.00 & 0.24            & 0.03            & 0.99 \\
    \end{pmatrix}$} \hspace{1cm}
    \subfloat[][{$[1.6,1.9]\, {\mathrm{\,Ge\kern -0.1em V\!/}c^2}\xspace$}]{$\begin{pmatrix}
0.34 & \phantom{+0.00} & \phantom{+0.08} & \phantom{+0.02} \\
0.00 & 0.51            &             &  \\
0.08 & 0.00            & 0.75            &  \\
0.02 & 0.15            & -0.01           & 1.01 \\
    \end{pmatrix}$}
\end{document}
