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\section{Discussion}  \begin{itemize}   \item %\begin{itemize}   %\item  Possible selection effects in the asteroseismic observations \item %\item  Possible extra angular momentum transport mechanisms \begin{enumerate}   \item %\begin{enumerate}   %\item  Internal gravity waves \item %\item  Fossil / Convective-Dynamo generated magnetic fields \end{enumerate}   \end{itemize} %\end{enumerate}   %\end{itemize}  Ensemble asteroseismology is providing outstanding results regarding the internal rotation of low-mass stars. It is important however to keep in mind that only 22$\%$ of the red giants sample analyzed by seismologists have identifiable mixed modes and rotational splittings \citep[313 out of 1399 stars, see e.g.]{Mosser:2012}.   In particular confusion between mixed modes and rotational splittings could in principle have led to a bias toward stars with slower rotating cores (e.g. stars that did spin down in binary systems or with fossil magnetic fields). We believe these potential biases need to be carefully addressed as they could have important repercussion on the theoretical interpretations.