What's the difference between limiters and ultimate limiters?

Limiters establish the minimum and maximum variable rate or coverage amount before it's added to, subtracted from, or multiplied by the standard rate or coverage.

Ultimate limiters establish the minimum and maximum variable rate or coverage amount after it's added to, subtracted from, or multiplied by the standard rate amount. For example, the ultimate high limit value sets the absolute maximum rate amount when you select the Add to treatment rule. This rule adds the variable rate calculated result to the standard rate calculation.