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In the Show menu, you can choose whether commits, code line additions or deletions should be displayed in the general graph. You can drag across the graph to show contributor analytics for a certain period of time (this feature is available as a part of the Advanced pack).
The contributors are ordered by number of commits
they made, so that you can easily figure out how exactly your team performs. Talk id talk-110
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Clicking the name of a user takes you to the Contributions graph (this feature is available as a part of the Advanced pack).