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\pgftext[at={\pgfpoint{3.29845in}{3.59197in}}] {\makebox(0,0)[t]{\rotatebox{-15}{\hbox{\color{rgb_000000}$\Delta x'$}}}}
\pgftext[at={\pgfpoint{3.99019in}{4.28371in}}] {\makebox(0,0)[l]{\rotatebox{-15}{\hbox{\color{rgb_000000}$\Delta t'$}}}}
\pgftext[at={\pgfpoint{-0.027674in}{0.872326in}}] {\makebox(0,0)[r]{\hbox{\color{rgb_000000}$O$}}}
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\pgftext[at={\pgfpoint{1.8in}{-0.166044in}}] {\makebox(0,0)[t]{\hbox{\color{rgb_000000}\textsc{Fig.~17.}}}}
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