How to normalize the Incidence angle of Sentinel-1 images?

Thank you for your reply,
This way is that you mentioned in here?https://forum.step.esa.int/t/normalize-incidence-angle/8016/2
Range Doppler Terrain Correction can output three angles: Incidence Angle from ellipsoid, local Incidence Angle, projected local Incidence Angle.Which represents the incidence angle?
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