/usr/share/pyshared/matplotlib-1.1.1rc.egg-info/top_level.txt is in python-matplotlib 1.1.1~rc1+git20120423-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | pylab
mpl_toolkits
matplotlib
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