resistance ranges

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Are TC resistance ranges rules or more like guidelines?

A mod will only achieve its maximum rated output over a range of resistances. I have some figures from a mod and it develops max Watt from 0.12 to 1.08 ohms.
It specifies a range of 0.1 to 1 ohms as its TC resistance range, almost the same as the max Watts range. Is this a coincidence?

Is the upper 1 ohm just arbitrarily chosen to match max power and it will provide TC at higher resistances or is it an enforced limit?

resistance ranges