Fig. 1

PastView solving process. The solving process of PastView includes five steps (1–5). The first step is dedicated to the input of an analysis (e.g. loading a tree and its annotations, importation of ancestral annotation). Step 2 is related to tree and annotations edition (settings of colors to annotations, tree view management, etc.). The step 3 of the solving process is related to the computing and displaying of ancestral annotations. Step 4 is dedicated to the study of ancestral annotations transitions. The last step is related to comparative analysises, such as visualizing different ancestral annotations sets for a given tree