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Full Spectrum Matching Method
The Least Squares HQI of the unknown from the library entry is calculated as the sum of the squares of the vector difference:
Where Lib is the library entry being searched, Unkn is the unknown spectrum, and n is the number of data points in the library entry and reduced unknown spectrum. Since each library or unknown data point is 0 to 1.0, the best match is 0 and the worst is 1.000. Spectral regions are excluded from the calculation by setting the corresponding values in the Lib and Unkn to zero. | 
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