Targets2 – Specifies the object(s), on which the instances are scattered. Targets can be mesh objects, curves and proxies.
Factors – This option is only available when On Surfaces scattering is set to Random distribution or the scattering mode is set to 3D - In Bounding Box. Determines how many instances are scattered on the currently selected Targets object(s). Note that for the Factors option to work correctly, you need at least two target objects.
Models2 – Specifies the objects which are scattered on the Targets object(s). Models can be mesh objects, proxies, Volume Grid, and lights.
Frequencies – This option is only available when there are more than one Models objects. Determines the frequency of the currently selected instanced object in relativity to the others.