\documentclass{article}
\usepackage[usenames]{color}
\usepackage{gastex}
\begin{document}
% and more ...
\begin{center}
\begin{picture}(120,52)(-35,-37)
\put(-35,-37){\framebox(120,52){}}
\node[Nw=16,linecolor=Yellow,fillcolor=Yellow](A)(-20,0){initial}
\imark[iangle=200,linecolor=Peach](A)
\node[Nmr=0,Nw=14,fillgray=0.85,
dash={1}0](B)( 20,0){\textcolor{RedViolet}{final}}
\fmark[flength=10,fangle=-30,dash={3 1 1 1}0](B)
\node[Nadjust=wh,Nadjustdist=2,Nmr=3,Nmarks=r,linecolor=Green](C)(60,-20){$\left(
\begin{array}{ccc}
2 & 1 & 0
\\
-1 & 0 & 1 \\
0 & -1 & 2
\end{array}
\right)$}
\rmark[linecolor=Green,rdist=1.4](C)
\drawedge[curvedepth=5,linecolor=Red](A,B){\textcolor{Cyan}{curved}}
\drawedge[ELside=r,ELpos=35](A,B){straight}
\drawedge[curvedepth=-25,ELside=r,dash={1.5}0](A,B){far}
\drawloop[ELpos=75, loopangle=150, dash={0.2 0.5}0](A){loopCW}
\drawloop[loopCW=n,ELside=r,loopangle=30,dash={3 1.5}{1.5}](B){loopCCW}
\drawqbpedge[ELside=r,ELdist=0,dash={4 1 1 1}0](B,-90,C,180){qbpedge}
\drawloop[ELpos=70,loopangle=0](C){$b / 01$}
\drawloop[loopCW=n,ELpos=75,ELside=r,loopangle=-90,sxo=6](C){$a /
01$}
\drawloop[ELpos=75,loopangle=-90,sxo=-6](C){$b / 10 $}
\drawloop[loopangle=50](C){$b / 01$}
\drawloop[ELpos=75,loopangle=148](C){$b / 01$}
\end{picture}
\end{center}
\end{document}