\documentclass{article} \usepackage{amsmath,amssymb,pgf,tikz} \usetikzlibrary{arrows,automata}  \usetikzlibrary{decorations.pathreplacing}  % credit to http://tex.stackexchange.com/questions/128064/how-to-overbrace-underbrace-in-text-mode-using-tikz \tikzstyle{overbrace text style}=[above, pos=.5, yshift=3mm] \tikzstyle{overbrace style}=[decorate,decoration={brace,raise=2mm,amplitude=3pt},-]  \begin{document}  \begin{tikzpicture}[->,>=stealth',shorten >=1pt,auto,node distance=1.5cm,semithick]   \tikzstyle{every state}=[fill=white,draw=black,text=black,minimum size=1.1cm]    \node (A) {};   \node[state] (A2) [right of=A] {$\lambda_1$};   \node[state] (A3) [right of=A2] {$\lambda_1$};   \node (A4) [right of=A3] {$\cdots$};   \node[state] (A5) [right of=A4] {$\lambda_1$};   \node (A6) [right of=A5] {};    \draw [overbrace style] (A2.north west) -- (A5.north east) node [overbrace text style] {$l_1$};    \node (B) [below of=A,node distance=2cm] {};   \node[state] (B2) [right of=B] {$\lambda_2$};   \node[state] (B3) [right of=B2] {$\lambda_2$};   \node (B4) [right of=B3] {$\cdots$};   \node[state] (B5) [right of=B4] {$\lambda_2$};   \node (B6) [right of=B5] {};    \draw [overbrace style] (B2.north west) -- (B5.north east) node [overbrace text style] {$l_2$};    \node (C) [below of=B] {};   \node (C2) [right of=C] {\vdots};   \node (C3) [right of=C2] {};   \node (C6) [below of=B6] {};    \node (D) [below of=C] {};   \node[state] (D2) [right of=D] {$\lambda_n$};   \node[state] (D3) [right of=D2] {$\lambda_n$};   \node (D4) [right of=D3] {$\cdots$};   \node[state] (D5) [right of=D4] {$\lambda_n$};   \node (D6) [right of=D5] {};    \draw [overbrace style] (D2.north west) -- (D5.north east) node [overbrace text style] {$l_n$};    \node (S) [left of=C] {start};   \node (E) [right of=C6] {end};    \path[-] (A.center) edge node {$p_1$} (A2);   \path[-] (B.center) edge node {$p_2$} (B2);   \path[-] (D.center) edge node {$p_n$} (D2);    \path[-] (A2) edge node {} (A3);   \path[-] (B2) edge node {} (B3);   \path[-] (D2) edge node {} (D3);    \path[-] (A3) edge node {} (A4);   \path[-] (B3) edge node {} (B4);   \path[-] (D3) edge node {} (D4);    \path[-] (A4) edge node {} (A5);   \path[-] (B4) edge node {} (B5);   \path[-] (D4) edge node {} (D5);    \path[-] (A5) edge node {} (A6.center);   \path[-] (B5) edge node {} (B6.center);   \path[-] (D5) edge node {} (D6.center);    \path[-] (A.center) edge node {} (D.center);   \path[-] (A6.center) edge node {} (D6.center);    \path (S) edge node {} (C.center);   \path (C6.center) edge node {} (E);  \end{tikzpicture} \end{document}