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sagetexpackage.dtx

 % integer points on the $x$-axis, but rather $\pi/2$, $\pi$, $3\pi/2$,
 % and $2\pi$.)
 %
-% Till Tantau has some good commentary on the use of graphics in
-% \href{http://www.ctan.org/tex-archive/graphics/pgf/}{section 6 of the
-%   \textsc{pgf} manual}. You should always give careful thought and
+% Till Tantau has some good commentary on the use of graphics in the
+% \href{http://www.ctan.org/tex-archive/help/Catalogue/entries/pgf.html}{``Guidelines
+%   on Graphics'' section of the \textsc{pgf} manual} (chapter 7 of the
+% manual for version 2.10). You should always give careful thought and
 % attention to creating graphics for your document; I have in mind that
 % a good workflow for using \ST for plotting is something like this:
 %