# Index copied into Excel misreads 'fi' combination

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?

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


No ligatures (ahem, not tested).