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Look up table for a given function

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The shape he posted above is nonlinear, seeming that refers to a broad range of temperature. Anyway, the question lacks of details concerning to the required accuracy. This information could dictate the suited approach.
 

One of these tables (the 10x10 bit) produces the temperature offset. The other table (14x14 bit) are for different purposes.
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A reasonable linear interpolation would have e.g 16 to 64 points, so considerably lower memory footprint.

Anyway, the question lacks of details concerning to the required accuracy. This information could dictate the suited approach.
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True, of course. So let's stop the general discussion.
 

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