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+%--------------------------------------------
+%
+% Package pgfplots
+%
+% Provides a user-friendly interface to create function plots (normal
+% plots, semi-logplots and double-logplots).
+%
+% It is based on Till Tantau's PGF package.
+%
+% Copyright 2007/2008 by Christian Feuersänger.
+%
+% This program is free software: you can redistribute it and/or modify
+% it under the terms of the GNU General Public License as published by
+% the Free Software Foundation, either version 3 of the License, or
+% (at your option) any later version.
+%
+% This program is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with this program. If not, see <http://www.gnu.org/licenses/>.
+%
+%--------------------------------------------
+
+
+\def\pgfplots@error#1{\PackageError{pgfplots}{#1}{}}%
+\def\pgfplots@warning#1{\pgfplots@message{! Package pgfplots Warning: #1}}%
+\def\pgfplots@message#1{%
+ \immediate\write16{#1}%
+}%
+
+
+\pgfutil@ifundefined{pgfkeys}{%
+ \pgfplots@error{It seems your version of PGF/Tikz is older than 2.00. Unfortunately, pgfplots requires at least version 2.00 ... you may need to update your TeX-Distribution or install PGF manually, sorry}%
+}{\relax}
+
+\def\pgfplots@EOI{\pgfplots@EOI}%
+
+\newif\ifpgfplots@loc@tmp
+\newtoks\t@pgfplots@toka
+\newtoks\t@pgfplots@tokb
+\newtoks\t@pgfplots@tokc
+\newdimen\pgfplots@tmpa
+
+% use these macros for GLOBAL temporary assignments.
+% you can NEVER rely on their values unless you know exactly what you are doing.
+\gdef\pgfplots@glob@TMPa{}%
+\gdef\pgfplots@glob@TMPb{}%
+\gdef\pgfplots@glob@TMPc{}%
+
+% use these macros for LOCAL temporary assigments.
+% you can NEVER rely on their values unless you know exactly what you are doing.
+\def\pgfplots@loc@TMPa{}%
+\def\pgfplots@loc@TMPb{}%
+\def\pgfplots@loc@TMPc{}%
+
+
+% Invokes code #2 if file '#1' exists and #3 if not.
+\def\pgfplots@iffileexists#1#2#3{%
+ \begingroup
+ \openin1=#1
+ \ifeof1
+ \xdef\pgfplots@glob@TMPa{0}%
+ \else
+ \closein1
+ \xdef\pgfplots@glob@TMPa{1}%
+ \fi
+ \endgroup
+ \if1\pgfplots@glob@TMPa
+ #2%
+ \else
+ #3%
+ \fi
+}
+\endinput