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\section*{Software compilation}
Download the sources of the software package virtualleaf from \verb"http://code.google.com/p/virtualleaf/". The plugins that are used for this paper are enclosed as Supporting Information. To install, first install and compile VirtualLeaf as described in source package. Then put the \verb"auxinsimon.*" files in directory \verb"VirtualLeaf\src\build_models", and put \verb"basis-floral_ortime.xml" in directory \verb"VirtualLeaf\data\leaves". Finally, compile VirtualLeaf, and double-click it to run.

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