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In the Code Frequency tab you can see the Code Frequency graph that shows the project dynamics in terms of lines of code.
The green and red graphs with the left-hand scale show added and deleted lines of code per week respectively. The dotted blue line with the right-hand scale represents the total number of existing lines. The graph covers the whole project from its start to the current week.
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Hover over a specific day in the graph to view detailed statistics for it in a pop-up tip.