**Table 1:** Wave parameters of propagating wave packets.
$\begin{table}% latex2html id marker 309\par \begin{displaymath} \begin{array... ...{{d}}$\space Measurements from Fig.~\protect\ref{tracecontext}c. \par\end{table}$

	1 Introduction
	2 Observations
	3 Analysis of displacement signatures
	4 Discussion
	References