Fig. 8.
Left panel: 3D density distribution of PMS sources younger than 20 Myr on the galactic plane. The Sun is in (0, 0), the x-axis is directed towards the galactic centre, and the y-axis towards the direction of the galactic rotation. The z-axis is perpendicular to the plane. The contours represent the 0.2, 0.4, 0.6, 0.8, and 1 density levels. Right, top panel: 3D density distribution of the PMS sample (age < 20 Myr) perpendicular to the galactic plane. Contour levels are the same as on the left. Right, bottom panel: 3D density distribution of the PMS sample (age < 20 Myr) along the rotation axis.
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