What equations, units, etc. are used for radial distortion?

This doesn't appear to be in the documentation. I need to convert a lens profile to a different model for lens distortion used in research software, but after measuring the distortion manually for a few pixels, it isn't clear to me how the radial distortion parameters would be applied to get those measured numbers.

Hello all. I downloaded the Adobe Lens Profile Creator to create a profile for the lens of my camera (canon powershot SX40 HS using CHDK), but I am not able to unzip the zip file program. Updated the winrar and even then it still fails. Can anyone help me? Do any of you have a profile for lenses canon powershot SX40 HS?

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