% T junction NORTH
\newsavebox{\tjn}
\savebox{\tjn}(4,4){
\begin{picture}(4.00,4.00)
\put(2.00,2.00){\line(0,1){2.00}}
\put(0.00,2.00){\line(1,0){4.00}}
\put(2.00,2.00){\circle*{1.0}}
\end{picture}
}