[pstricks] pst-add behavior

[Francisco A. S. Grossi]

Look, if you will, this small sample. As it is, the two lines align 
perfectly with the frame borders.

If I remove the comment from the 5th line (package pst-add), the frame is 
larger; is this a expected behavior?

Francisco Grossi

\documentclass[a4paper,12pt,fleqn]{report}
\usepackage[T1]{fontenc}
\usepackage[brazil]{babel}
\usepackage{pst-all}
%\usepackage{pstricks-add}

\begin{document}

\begin{table}[H] \centering
 \begin{pspicture}(0,0)(6,4)
  \psframe[doubleline=true,linecolor=blue](-0.1,-0.1)(6.1,4.1)
  \psline[linecolor=red](0,2)(6,2)
  \psline[linecolor=red](3,0)(3,4)
 \end{pspicture}
\end{table}

\end{document}