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\begin{center}
Answer to the Referee Report\\[2ex] 
{\Large
``Using NFFT 3 -- a software library for various \\ nonequispaced fast
  Fourier transforms'' }\\[2ex] 
by Jens Keiner, Stefan Kunis, and Daniel Potts
\end{center}
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First of all, we thank all three referees for their helpful comments and valuable
suggestions.

\section*{Referee 1}
\label{sect:1}

\begin{itemize}
  \item
    \begin{quote}
      Referee:
        I am not so familiar with the norms in TOMS, but it seems to me that
        installation instructions (section 3.1) would not have longevity that
        merits archiving, and could be relegated to the online code package.
    \end{quote}
    We do think that readers might appreciate brief installation instructions.
    They have been shortened and moved to Appendix A.1.

  \item
    \begin{quote}
      Referee:
      As an optional note, it would be convenient if the CGNR routine allowed
      a user-defined preconditioner.
    \end{quote}
    We appreciate the suggestion and are well aware that a variety of
    Toeplitz-preconditioner are possible for the CGNR routine.
    However, numerical experience (in line with theoretical results) suggests
    that for reasonably well-distributed point sets, solving the weighted
    normal equation works well with the used ``diagonal preconditioner''
    $\mathbf{W}$ and $\mathbf{\hat W}$, already.
\end{itemize}

\end{document}
