Comparison of the spatial distribution of OCs and MGs. Left column: distribution in Cartesian heliocentric coordinates of 3530 OCs in the high quality sample of OCs from Table 3. The Sun is at X = Y = 0 pc, the galactic centre is to the right, and the Z axis denotes height above or below the plane. OCs are shaded by the mass of the entire detected cluster, including tidal tails. Right column: identical plot, but for 539 MGs in the high quality sample.