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Using R and its knitr package under Windows 10 to produce a PDF file with an index, I have found that indexed words with 'fi' in them often appear incorrectly when I copy the index into Excel [to do other work with it there]. For example, con dence intervals or entropy based lter.

Is there a package or technique that will correct this problem?

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Without MWE difficult to say, but what about this:

\documentclass{article}
\usepackage{microtype}
\DisableLigatures{}
\begin{document}
 Auflaufform
\end{document}

No ligatures (ahem, not tested).

(Example stolen here: http://texwelt.de/wissen/antwort_link/57/ )

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  • I get this error in the log file: Disabling ligatures of a font is only possible (microtype) with pdftex version 1.30 or newer. (microtype) Ignoring \DisableLigatures.
    – lawyeR
    Aug 4 '16 at 19:20
  • 1
    Well, then please update your installation of texlive or miktex.
    – Keks Dose
    Aug 4 '16 at 20:31

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