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Fig. 5


Positions of the cluster spatial sub-samples considered. The left panel shows the “planar” samples and the right panel shows the “vertical” ones. Gray dots show all MWSC clusters, while coloured dots correspond to the completeness samples. Red, magenta, green, blue, and brown dots correspond to the Inner, Outer, Local, Thin-disk, and Thick-disk sub-samples, respectively.Their limits are shown with dotted lines. Yellow dots indicate the rest of the general completeness sample described in Sect. 3. The big plus sign marks the Galactic centre. Thick curves show approximate positions of the spiral arms (as taken from Benjamin 2008).

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