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This feature allows you to make a comparison between two analyses of the same application. You have to click on “Compare” on the top-left of the page.
Once loaded, you will be able to choose the analyses to compare.
You select an analysis (the selected analysis) and compare its results with a previous one (the previous analysis)
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Now you can export your defects list to a CSV file, which indicates whether if your defects are new or removed ones.