Massive Extinction event (Tm)
This model allows the user to simulate a massive extinction event. At a given time, every extant lineage will become with a probability p. The situation then proceeds normally with the given speciation and extinction rates.
An example of a tree simulated with the Tm mode
MASS_EXTINCTION 4-0.95
The first number represents the time at which the mass extinction takes place (in this case 4), the second number is the extinction probability of every lineage at that point