\begin{tabular}{cc}
\toprule
light source &\hspace{20pt} visual effect\\
\midrule
left
&
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\\[-30pt]
right
&
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\\[-30pt]
back
&
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% front edges
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\psline[linestyle=dotted,linewidth=0.9pt,linecolor=black,fillstyle=none]{-}(105.70, 60.76)(167.50,123.08)
\end{picture}
\end{array}$
\\[-30pt]
\\
\bottomrule
\end{tabular}