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+\documentclass[a4paper]{article}
+\usepackage[utf8]{inputenc}
+
+\usepackage{tikz}
+\usepackage{hyperref}
+
+\IfFileExists{pgfplots.sty}{%
+ \usepackage{pgfplots}
+}{}%
+
+\IfFileExists{tikzlibraryexternal.code.tex}{%
+ \usetikzlibrary{external}
+}{%
+ \message{TEST IS RUNNING IN COMPATIBILITY MODE}%
+ % a test to check for pgf 2.00 compatibility, to check whether the
+ % external library copy shipped with pgfplots works:
+ \usepgfplotslibrary{external}
+}%
+
+\pgfkeys{/pgf/images/include external/.code={\href{file:#1}{\pgfimage{#1}}}}