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+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%% This file is a copy of some part of PGF/Tikz.
+%%% It has been copied here to provide :
+%%% - compatibility with older PGF versions
+%%% - availability of PGF contributions by Christian Feuersaenger
+%%% which are necessary or helpful for pgfplots.
+%%%
+%%% For reasons of simplicity, I have copied the whole file, including own contributions AND
+%%% PGF parts. The copyrights are as they appear in PGF.
+%%%
+%%% Note that pgfplots has compatible licenses.
+%%%
+%%% This copy has been modified in the following ways:
+%%% - nested \input commands have been updated
+%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%% Date of this copy: Di 29. Dez 22:11:16 CET 2009 %%%
+
+
+
+% Copyright 2008 by Christian Feuersaenger
+%
+% This file may be distributed and/or modified
+%
+% 1. under the LaTeX Project Public License and/or
+% 2. under the GNU Public License.
+%
+% See the file doc/generic/pgf/licenses/LICENSE for more details.
+%
+% In addition to the above licenses, this particular file may also be
+% directly inlined into other documents and this copyright notice may
+% be removed. Additionally, when you inline this file, you may modify
+% it as needed and you may remove comments.
+%
+% This file is intended to be distributed or even inlined into a file
+% when a document needs to be typeset on a system that does not have
+% pgf/TikZ installed.
+%
+% It replaces \tikzpicture/ \endtikzpicture and \tikz and invokes the
+% \includegraphics with the correct file name instead.
+
+\RequirePackage{graphicx}
+
+\toksdef\t@tikzexternal@tmpa=0
+\toksdef\t@tikzexternal@tmpb=1
+
+\def\tikzexternalize{\@ifnextchar[{\tikzexternalize@opt}{\tikzexternalize@opt[]}}%
+\def\tikzexternalize@opt[#1]#2{\def\tikzexternal@realjob{#2}}
+
+\def\tikzsetnextfilename#1{\gdef\tikzexternal@nextfile{#1}}
+\def\tikzsetexternalprefix#1{\def\tikzexternal@filenameprefix{#1}}
+\def\tikzsetfigurename#1{\def\tikzexternal@figurename{#1}}%
+\tikzsetnextfilename{}
+\tikzsetexternalprefix{}
+\tikzsetfigurename{\tikzexternal@realjob-figure}%
+
+\long\def\tikzpicture#1\end#2{% collect every thing up to \end{tikzpicture}
+ \def\tikzexternal@laTeX@collectpicture@@{#2}%
+ \ifx\tikzexternal@laTeX@collectpicture@@\tikzexternal@laTeX@tikzpicturestring
+ \tikzexternal@image
+ \end{tikzpicture}%
+ \else
+ \expandafter
+ \tikzpicture
+ \fi
+}%
+\def\endtikzpicture{}
+\def\tikzexternal@laTeX@tikzpicturestring{tikzpicture}%
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Replacement for \tikz short command:
+\def\tikz{\@ifnextchar[{\tikz@opt}{\tikz@opt[]}}
+\def\tikz@opt[#1]{\@ifnextchar\bgroup{\tikz@opt@{#1}}{\tikz@opt@@{#1}}}
+\def\tikz@opt@#1#2{\tikz@opt@process{#1}{#2}}
+\def\tikz@opt@@#1{%
+ \def\tikz@next{\tikz@collectnormalsemicolon{#1}}%
+ \ifnum\the\catcode`\;=\active\relax%
+ \def\tikz@next{\tikz@collectactivesemicolon{#1}}%
+ \fi%
+ \tikz@next}
+\def\tikz@collectnormalsemicolon#1#2;{\tikz@opt@process{#1}{#2;}}
+{
+ \catcode`\;=\active
+ \gdef\tikz@collectactivesemicolon#1#2;{%
+ \tikz@opt@process{#1}{#2;}%
+ }
+}
+\def\tikz@opt@process#1#2{\tikzexternal@image}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\def\tikzexternal@image{%
+ \leavevmode
+ \begingroup
+ \t@tikzexternal@tmpa=\expandafter{\tikzexternal@filenameprefix}%
+ \ifx\tikzexternal@nextfile\empty
+ \expandafter\ifx\csname c@tikzext@no@\tikzexternal@figurename\endcsname\relax
+ \expandafter\gdef\csname c@tikzext@no@\tikzexternal@figurename\endcsname{0}%
+ \fi
+ \t@tikzexternal@tmpb=\expandafter{\tikzexternal@figurename}%
+ \count0=\csname c@tikzext@no@\tikzexternal@figurename\endcsname
+ \xdef\tikzexternal@curfilename{\the\t@tikzexternal@tmpa\the\t@tikzexternal@tmpb\the\count0 }%
+ \advance\count0 by1\relax
+ \expandafter\xdef\csname c@tikzext@no@\tikzexternal@figurename\endcsname{\the\count0 }%
+ \else
+ \t@tikzexternal@tmpb=\expandafter{\tikzexternal@nextfile}%
+ \xdef\tikzexternal@curfilename{\the\t@tikzexternal@tmpa\the\t@tikzexternal@tmpb}%
+ \fi
+ \endgroup
+ \global\let\tikzexternal@nextfile=\empty
+ \tikzexternalimage\tikzexternal@curfilename
+}%
+\def\tikzexternalimage#1{%
+ % now check for (optional) .dpth files for the 'baseline' option:
+ \begingroup
+ \setbox1=\hbox{\includegraphics{#1}}%
+ \openin1=#1.dpth
+ \ifeof1 \box1
+ \else
+ \read1 to\pgfincludeexternalgraphics@dp \closein1
+ \dimen0=\pgfincludeexternalgraphics@dp\relax
+ \hbox{\lower\dimen0\box1}%
+ \fi
+ \endgroup
+}
+\def\tikzset#1{}\def\pgfkeys#1{}\def\pgfqkeys#1#2{}
+\long\def\beginpgfgraphicnamed#1#2\endpgfgraphicnamed{\tikzexternalimage{#1}}
+