docs/fig/tensors_mpa.tikz
\directlua{mpt.defaults['len_vertical_legs'] = 0.5}
\begin{luacode}
mpt.draw_node({S=1,W=1,E=1}, {})
mpt.draw_node({S=1,W=1,E=1}, {x=1.5})
mpt.draw_node({S=3,W=1,E=1}, {x=3.25, tensor_width=1.5})
mpt.draw_node({S=2,W=1,E=1}, {x=5.1, tensor_width=1.2})
mpt.draw_node({S=3,W=1,E=1}, {x=6.9, tensor_width=1.5})
\end{luacode}