Fig. 2From: TMRS: an algorithm for computing the time to the most recent substitution event from a multiple alignment columnInside and outside variables. \(c_k\) denotes the concestor nodes on the target lineage. \(b_k\) denotes the sibling node of \(c_{k-1}\). \(\alpha (b_k,*)\) represents the inside variable, while \(\beta (c_k,*)\) represents the outside variable. \(\gamma (b_k,*)\) represents a dynamic programming variable in Eq. 2 in the main textBack to article page