Highcharts in polar mode: line does not look like a function - highcharts

I'm using Highcharts in polar mode. I am using spline but it is rendered as a linear spline, rather than a polar one.
Please see the attached picture to compare what I want (red) vs what I get (black).
How can I solve? Thanks
Bad polar chart

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Found it. There is a translate() function to do the conversion. See the Highcharts support forum thread for info on the function.

Use Axis.toPixels() and Axis.toValue()

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