FLAASH always outputs scaled reflectance stored as integer data (not floating point values between 0-1.0).  This is to save file space as a floating point file will be much larger than an image stored as integer.  In the advanced parameters of FLAASH you can see that the output is scaled by 10,000.  So, to determine what the reflectance value is for your image, you can divide the data by 10,000.

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