Comparison of the spatial separation histograms of the nearest neighbours in coordinate space between the young (blue) and old (red) Galactic OC population in the entire COCD (upper panel; young <20 Myr, old >400 Myr) and the MWSC within its completeness limit of 1.8 kpc (lower panel; young <50 Myr, old >700 Myr).
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