The effects of partial tree joining. A depiction of the effects of partial tree joining on the images of the partial trees involved. Partial trees A and B are combined to form partial tree C. A and B have fewer branches than C, therefore they can be resolved into more trees and each has a larger image than C. The image of C is contained in the intersection of the image of A and B, as any resolution of C is also a resolution of A and a resolution of B. Although the image of C is smaller it is more detailed, as C is more resolved.
Sundberg et al. BMC Bioinformatics 2012 13(Suppl 13):S8 doi:10.1186/1471-2105-13-S13-S8