\begin{texdraw}
\drawdim cm

% abcisas
\move(-1.6 0)
\avec(0.7 0)

% ordenadas
\move(0 -0.5)
\avec(0 2)
\rmove(-0.2 0)
\textref h:R v:C \htext{$j\omega$}

%% POLO pi/4
\move (-1.414 1.414)
\textref h:C v:C \htext{x}

%%
%% Vector omega
%%
\move (0 0)
\avec (-1.414 1.414)
\move (-0.6 0.707)
\textref h:L v:B \htext{$\omega_0$}

%sigma
\move (-1.414 -0.1)
\textref h:C v:T \htext{$\sigma$}

%omega n
\move (0.1 1.414)
\textref h:L v:C \htext{$\omega_n$}

% rayitas
\lpatt(0.1)
\move (-1.414 0)
\lvec (-1.414 1.414)
\lvec (0 1.414)

\end{texdraw}