Connecting Series in Radar Plot

Short but useless answer -- yes there is a way to do this in Excel.

One thing to note -- the "outer ring" axis of an Excel radar chart can only be a category axis. Your outer ring is a numeric axis (angle is a number, not a category). I think this will be difficult as a pure radar chart, however, it looks very much like a "polar" (distance, angle) chart, which naturally leads me to Andy Pope's polar plot add in: http://andypope.info/charts/polarplot3.htm Testing Pope's add-in suggests that he simply creates a combination radar + xy scatter chart using the raw data (most of the work is in the spreadsheet). With this kind of chart, connecting the two data series should be as simple as adding the end points of one series to the ends of the other data series.

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note how the first and last angle is duplicated and a copy of the associated max distance is added to the min distance data series.

Without the need to fill between series, that might be all that is needed for this -- minor adjustment to the chart data and use Pope's Polar Plot add-in. Filling between the series is done by adding more data series as area or stacked area charts. https://peltiertech.com/fill-under-b...n-excel-chart/ In your case, this has the potential to become somewhat tedious, as you may need to fill the area in a piecemeal fashion.

At this point, I make these recommendations:
Download Andy Pope's polar plot add-in and learn all you can about how it creating a combination radar + scatter combination chart.
Carefully go over the examples in Peltier's "fill between chart series" tutorial and understand how it works.
If you need help from us to understand and apply these skills, upload a sample workbook (with dummy data as needed) that we can look at and use to test.