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Region emissivity is used to compensate for surfaces with uniform emissivity. Emissivity tables are used to compensate for surfaces with emissivity variation between pixels.
A choice must be made to use either region emissivity correction or emissivity table correction, not both. If an emissivity table is applies and also a region emissivity is set less than 1.00, the result will be a combined emissivity correction that will result in erroneously high measurements.