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I have some value pairs. They are inversely proportional. I want to have a formula to get the second value from the first value.

Speed Delay 10    0.142 15    0.087 20    0.064 25    0.049 30    0.036 37    0.03 45    0.017 68    0.016 

I guess there have to be an offset and a factor. Is it necessary to have min and max values?

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