Smoothed radar chart

Hi All,

Does anyone have an idea of how to create such chart, i.e with proper smoothing between points with ggplot ? (Theme is not part of the question)

Already found some interesting proposals but nothing that allows important variations between 3 points: For a low value in between two high ones, a clear inflexion is visible resulting in peaks.

I guess a smooth extrapolation between points (polynomial fit ?) would do the trick but did not managed to force passage by exact given values while doing this...

Any help would be appreciated.


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