This file is indexed.

/usr/share/doc/octave-optim/html/XREFvfzero.html is in octave-optim 1.4.0-1.

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

The actual contents of the file can be viewed below.

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<meta http-equiv="refresh" content="0; url=vfzero.html#XREFvfzero">