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Where can I find the TikZ spy package?
I found a great article here: How to create magnified subfigures and corresponding boxes for portions of a large image
Even with Google and StackExchange search I can’t find a site to download the package. Can anyone help me?
spy is a TiKZ library not a package so it comes with TiKZ although its name in CTAN is pgf.
As Qrrbrbirlbel explains, you need to first load Tikz with \usepackage{tikz} and later any tikzlibrary with \usetikzlibrary{spy}.
You can find some more information abouts tikzlibraries in List of available TikZ libraries with a short introduction
\usepackage{tikz}and\usetikzlibrary{spy}.\usepackage{tikz} \usepackage{pgfplots} \usetikzlibrary{spy}i get this message:! I can't find file tikzlibraryspy.code.tex.... Without\usetikzlibrary{spy}tikz works fine.