Ellipse

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Title:       Ellipse 1
% Author:      Tobias Krähling
% Needs:       pstricks, pst-node
% DesignScale: unit=10mm
% Size:		     4.0 x 4.0	
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
{\sbPSTDefault\sffamily\psset{unit=10mm}
\begin{pspicture}(-2,-2)(2,2)
   \psline(-2,0)(2,0)
   \psline(0,-2)(0,2)
   \psellipse[linewidth=1.5pt,linecolor=sblinemed](0,0)(1.7,1.3)
   \pcline[arrows=->,linewidth=1.5pt](0,0)(1.7,0)\Bput{$\Vec{a}_1$}
   \pcline[arrows=->,linewidth=1.5pt](0,0)(0,1.3)\Aput{$\Vec{a}_2$}
   \psdots[dotscale=1.5](0,0)
   \uput[225](0,0){$\Vec{m}$}
\end{pspicture}
}