Cross‐correlation function (CCF) for the cluster and the template M0 Iab star, averaged over all echelle orders. The peak of the template star autocorrelation function has been scaled to the peak of the CCF to emphasize the difference in width (due to the convolution with the velocity‐distribution function of the cluster). The solid line is the antisymmetric part of the CCF, which otherwise is seen to be highly symmetric.