(U, V), (V, W) and (U, W) planes (from left to right) of sources into the member sample of each studied MGs. We used the same color code as in Fig. 5. The loci of the young-disk (YD) and old-disk (OD) populations (Eggen 1973a,b, 1989) are also marked in the (U, V) plane. The average velocity components of MGs (Montes et al. 2001) are also indicated with filled circles. We also over-plotted elliptical contours of three k values, which correspond to the 10% threshold for 1D (dashed line), 2D (dash-dotted line), and 3D (solid line) spatial considerations (Fig. A.2).
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