**Table 3:** Mean characteristics of MGs as function of the lower limit of lifetime; each mean value is given together with its $\pm$ $1 \sigma$ scatter around the mean.
$\begin{table}\par\begin{displaymath} \begin{array}{p{0.15\linewidth}cccccc} ... ...8& \\ \noalign{\smallskip } \hline \end{array} \end{displaymath} \end{table}$

	1 Introduction
	2 Preparation of divergence maps
	3 Feature tracking
	4 Results
	5 Discussion
	6 Conclusion
	References
	Online Material