In an Extra Input Fast Formula can you determine overridden rate values?

In an "Extra Input" Fast Formula attached to an Option in Plan Employee Payroll Contribution standard rate record, can you determine the overridden rate values when the rate for a given employee is overridden?

The Standard Rate records in question currently use either the "Calculate for Enrollment Rule" or the "Post Enrollment Calculation Rule" calculation methods.  As such I can use the same code from the "Rate Value Calculation" formula to determine the expected rate, but this doesn't work when the rate is overridden.