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Fig. 17.


Contours: density distribution of the selected sources projected in the Galactic plane (left), in the (X, Z) plane (centre), and in the (Y, Z) plane (the Sun is at (X, Y, Z) = 0, 0, 0). The arrows represent the velocities (in Galactic co-ordinates) estimated in Sect. 3 for all the groups, and are corrected for the solar motion. The colours of the arrows represent the log(age/yr) obtained by fitting the colour-magnitude diagrams of the clusters in Sect. 4.

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