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$\begin{xy} <1em,0em>: c*+{S}; p+/l\xylength/*+{F}**\dir{-},c=''F1'', p+/u\xyle... ...}, p+/r0.1em/**\dir{}?<*\dir{\vert}, p+/d0.1em/**\dir{}?<*\dir{\vert}, \end{xy}$


\begin{psfrags}\psfrag{S} [c][c]{S}\psfrag{F} [c][c]{F}\psfrag{s} [c][c]{{$\sigma$}}\psfrag{dsp3} [c][c]{{$dsp^3$}} \includegraphics{sf4.eps} \end{psfrags}