Fig. 1. Githru system. (a) The Global Temporal Filter shows commit trends by number of commits and CLOC (changed lines of code). (b) The Clustering Step controls the granularity of clustering. (c) The stem graph visualizes a cluster information of each commit at a single glance. (d) The Grouped Summary View provides a rough summary of the selected clusters. (e) A file icicle tree allows users to interactively observe the modified file hierarchy. (f) The commit list shows all the commits in a selected cluster. (g) Comparison View enables a comparison between selected groups.