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If you use one of the methods with _NORMED, then the max possible value is 1 (or for SQDIFF, the best is 0). Best of all, these are absolute. If your match is pretty bad, then the max value in the result will be 0.3 (for example).
The methods without _NORMED are faster, but they don't give you this check, so it's difficult to tell what the maximum value is.
