This file is indexed.

/usr/share/python-apt/templates/Tanglu.mirrors is in python-apt-common 1.4.0~beta3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#LOC:DE
http://de.archive.tanglu.org/tanglu/
http://mirror1.hs-esslingen.de/pub/Mirrors/archive.tanglu.org/tanglu/