[pstricks] some help about centering a pspicture

[cyrille piatecki]

Dear all,

Herer is a question which is not really pstricks but which have an 
interactio with it because when I put some points in the figures they 
are not in their right place.

On my computer, in the following text, the grid is obviously not 
centered. Is there a known inconsistency between the loaded packages ?

%
\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{natbib}
\usepackage{time}
\usepackage{pifont}
\usepackage{marvosym}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphics}
\usepackage{epsfig}
\usepackage{psfrag}
\usepackage{graphicx,subfigure}
\usepackage[a4paper]{geometry}
\geometry{hscale=0.75, vscale=0.75, centering}
\usepackage[T1]{fontenc}
\usepackage[english]{babel}
\usepackage{natbib}
\usepackage{pstricks,pst-all,pst-3dplot,pst-plot,pst-slpe,pst-eucl,pst-solides3d,pst-blur,pstricks-add}
\usepackage{xcolor}
\usepackage{amsmath,amssymb,example}
\usepackage{varioref}

\begin{document}
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
\begin{center}
\begin{pspicture}(0,0)(14,6)
\psgrid

\end{pspicture}
\end{center}
\end{document}