/usr/share/matplotlib/sample_data/README.txt is in python-matplotlib-data 1.3.1-1ubuntu5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | This is the sample data needed for some of matplotlib's examples and
docs. See matplotlib.cbook.get_sample_data for more info.
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