This file is indexed.

/usr/share/doc-base/fftw3-manual is in libfftw3-doc 3.3.3-7ubuntu3.

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

The actual contents of the file can be viewed below.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
Document: fftw3-manual
Title: FFTW Version 3 Manual
Author: Matteo Frigo and Steven G. Johnson
Abstract: This manual describes how to use fftw (version 3).
 FFTW is the Fastest Fourier Transform in the West, providing
 a comprehensive collection of fast C routines for computing
 discrete Fourier transforms.
Section: Programming

Format: HTML
Index: /usr/share/doc/libfftw3-doc/html/index.html
Files: /usr/share/doc/libfftw3-doc/html/*.html

Format: Info
Index: /usr/share/info/fftw3.info.gz
Files: /usr/share/info/fftw3.info.gz