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scale/offset clarified

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try that last part again:
To compute the scale and offset: 
   add_offset = dataMin
   scale_factor = (2^nbits - 2) / (dataMax - dataMin)

The precision of the data will be 1.0 / scale_factor.

To move between packed and unpacked values:
unpacked = (packed == 2^nbits-1) ? missing value : packed * scale_factor + add_offset
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