/usr/src/linux-source-3.13.0/debian/source/options is in linux-source-3.13.0 3.13.0-51.84.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # force "dpkg-source -I -i" behavior
diff-ignore
tar-ignore
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