fix figure overflow in tex

set a max-height

templates/tex/latex_base.tplx

@@ -37,7 +37,7 b' it introduces a new line'
 
 ((*- block data_png -*))
 \begin{center}
-\includegraphics[width=0.7\textwidth]{(((output.key_png)))}
+\includegraphics[width=0.7\textwidth, height=0.9\textheight, keepaspectratio]{(((output.key_png)))}
 \par
 \end{center}
 ((*- endblock -*))