  With the third observing run the number of gravitational wave emitting events
has increased significantly. The data of the recorded events is inspected to
search for overall properties on the population. The properties of
subpopulations are determined and compared to predictions from simulations. It
appears that the most outstanding systems follow linear relations in the
parameter space of the total binary and the chirp mass. Those relations are too
tight to have a stochastic origin and are supported by at least five
independent events each. The origin of the correlations is still open to be
confirmed, while possible sources, ranging from instrumental artefacts to
unknown physics, are discussed and partly excluded. Depending on the relation's
source the two events (GW190814 and GW200210_092254) having a smaller mass
component between 2.5 and 2.9 Msun may reveal in a very different light.
