Problem
The chart is no longer displayed in the Onpage > Text optimization (WDF*IDF) area.
Cause
No WDF*IDF analysis has been created yet
Solution
Log in to suite.xovi.de
navigate to Site Audit > Text optimization (WDF*IDF)
create a new analysis under START NEW OPTIMIZATION
once the analysis has been completed, the chart can be found under Onpage > Text optimization (WDF*IDF) > Analysis