/usr/share/matplotlib/mpl-data/stylelib/seaborn-dark-palette.mplstyle is in python-matplotlib-data 1.5.1-1ubuntu1.
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The actual contents of the file can be viewed below.
1 2 | # Seaborn dark palette
axes.prop_cycle: cycler('color', ['001C7F', '017517', '8C0900', '7600A1', 'B8860B', '006374'])
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