Dynamical evolution of star forming regions
  We model the dynamical evolution of star forming regions with a wide range of
initial properties. We follow the evolution of the regions' substructure using
the Q-parameter, we search for dynamical mass segregation using the Lambda_MSR
technique, and we also quantify the evolution of local density around stars as
a function of mass using the Sigma_LDR method.
  The amount of dynamical mass segregation measured by Lambda_MSR is generally
only significant for subvirial and virialised, substructured regions - which
usually evolve to form bound clusters. The Sigma_LDR method shows that massive
stars attain higher local densities than the median value in all regions, even
those that are supervirial and evolve to form (unbound) associations.
  We also introduce the Q-Sigma_LDR plot, which describes the evolution of
spatial structure as a function of mass-weighted local density in a star
forming region. Initially dense (>1000 stars pc^{-2}), bound regions always
have Q >1, Sigma_LDR > 2 after 5Myr, whereas dense unbound regions always have
Q < 1, Sigma_LDR > 2 after 5Myr. Less dense regions (<100 stars pc^{-2}) do not
usually exhibit Sigma_LDR > 2 values, and if relatively high local density
around massive stars arises purely from dynamics, then the Q-Sigma_LDR plot can
be used to estimate the initial density of a star forming region.
