If there is more than one static analysis result available then an aggregation trend chart will be shown on the project page that shows the analysis results in a single trend chart. You can choose the position of this aggregation trend:

AGGREGATION_TOOLS
  The aggregation trend is shown before all other analysis tool trend charts.
TOOLS_AGGREGATION
  The aggregation trend is shown after all other analysis tool trend charts.
TOOLS_ONLY
  The aggregation trend is not shown, only the analysis tool trend charts are shown.
AGGREGATION_ONLY
  The aggregation trend is only shown, no other analysis tool trend charts are shown.
NONE
  Neither the aggregation trend nor analysis tool trend charts are shown.