## Appendix A Validation of the AR System  
\begin{tabular}{c c c c c c c c c} \hline \hline  & \multicolumn{6}{c}{Validation of virtual reality} \\ \hline \multirow{3}{*}{\(-5\) (Not at all.)} & \multicolumn{3}{c}{1. Do you see the hand on the screen like yours?} & \multirow{3}{*}{4} & \multirow{3}{*}{5 (Perfect)} \\  & & & & & & & & \\  &  
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