what's the exact meaning of NICE_TIME in v$osstat

The official defiintion is:

NICE_TIME

Number of hundredths of a second that a processor has been busy executing
low-priority user code, totalled over all processors.
Is NICE_TIME one part of USER_TIME? or is NICE_TIME the time the CPU used on
low-priority user code AFTER switch from high-priority user code?

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