/usr/share/applications/ygraph.desktop is in ygraph 0.16~cvs20090218-1.2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Version=1.0
Encoding=UTF-8
Name=ygraph Scientific Data Plotter
GenericName=Scientific Data Plotter
Comment=Produce simple xy-plots of scientific data
Type=Application
Exec=ygraph
Icon=ygraph
Categories=Education;Science;
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