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diff --git a/tetrahedron.tex b/tetrahedron.tex
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+\input{settings.ttt}
+
+\begin{document}
+\begin{tikzpicture}[scale=2, line cap=round,line join=round,>=triangle 45,x=1.0cm,y=1.0cm]
+
+\input{coord-tet.tex}
+
+% Background varying in size depending on the main figure
+\fill[color=white] (-2,-2) rectangle (2,2);
+
+\filldraw[very thick, draw=my-color-draw-main,
+          fill=my-color-fill-main, fill opacity = 0.3]
+        (P0) -- (P1) -- (P2) -- cycle;
+
+\filldraw[very thick, draw=my-color-draw-main,
+          fill=my-color-fill-main, fill opacity = 0.7]
+        (P0) -- (P3) -- (P1) -- cycle;
+
+\draw[very thick, draw=my-color-draw-main, dashed] (P2) -- (P3);
+
+\end{tikzpicture}
+\end{document}
+