pExtinct                Probability that one initial case leads to an
                        outbreak that eventually dies out (stochastic
                        extinction)
pFinalSize              Final outbreak size probability
pFinalSizeAndGen        Joint probability of outbreak final size and
                        number of transmission generations
pFinalSizeAndGenSwitch1
                        Joint probability of outbreak final size and
                        number of transmission generations with
                        offspring distribution parameters switched
                        after generation one
pFinalSizeSwitch1       Probability of final outbreak size with
                        offspring distribution parameters switched
                        after generation one
pGen                    Probability that one initial case leads to an
                        outbreak lasting less than g generations of
                        transmission.
pGenSwitch1             Probability that one initial case leads to an
                        outbreak lasting less than g generations of
                        transmission, with offspring distribution
                        parameters switched after generation one.
pNextGenSize            Probability of y total transmission directly
                        from x independent infected individuals
pSizeAtGen              Probability that n initial cases lead to an
                        outbreak that lasts at least g generations of
                        transmission AND has exactly j total cases
                        after generation g
pSizeAtGenSwitch1       Probability that n initial cases lead to an
                        outbreak that lasts at least g generations of
                        transmission AND has exactly j total cases
                        after generation g, with offspring distribution
                        parameters switched after generation one
