[OS X TeX] alignment of subfigures

[Nitecki, Zbigniew H.]

I’m clearly misunderstanding some of the parameters  for floats, pspicture, and \psgrid.

The code below yields two grids of the same size (with different subdivisions).
Should I have set the two pspicture parameters differently?
From what I understand,
the two pspictures are both 9cm x 9cm boxes, so why are they aligned differently?


% !TEX TS-program = latex
\documentclass{article}

\usepackage{pstricks}
\usepackage{subfig}

\begin{document}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{figure}
\begin{center}
%
\subfloat[Level $2$]{
            \begin{pspicture}[unit=3cm](0,0)(3,3)
\psgrid[subgriddiv=3, gridlabels=0](0,0)(3,3)
\end{pspicture}
}\\
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\subfloat[Level $3$]{
            \begin{pspicture}[unit=1cm](0,0)(9,9)
\psgrid[subgriddiv=3, gridlabels=0](0,0)(9,9)
\end{pspicture}
}
%
%%%%%%%%
%
\caption{Level $2$ and Level $3$,}
\label{fig}
\end{center}
\end{figure}

\end{document}



yields























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