ES, YM and NQ settlement question...

What and when is the ES, YM, NQ settle price based on?
Is i tthe last trade, the mid-point, the opening price of the underlying index?

CME website says the time is noon 9/19/03...

Do they continue to trade after hours today? (18th) If so when do they stop?

Thanks for the clarity...

:)
 
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