Fig. 2.

(A) MCMC proposals. Current and proposed configurations represented in red and blue, respectively. A. OnePathMove adds a Brownian bridge to the path along the focal branch. (B) ThreePathMove shifts the instantaneous value at an internal node (vertical arrow) and propagates the shift linearly across the three surrounding branches. (C and D) TimePathMove shifts the time of a node by a random amount and resamples the paths within the smallest window bracketing the move (here defined by the three black filled circles). See text for details