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I notice on the cme website the trading hours are MON-THURS: 5:00 pm -3:15 pm & 3:30 pm - 4:30 pm (Daily maintenance shutdown 4:30 p.m.-5:00 p.m.) Just wondering since there is a maintenance shut down for 30 minutes and market closing at 3:15pm-3:30pm, how is the daily high and low calculated? I...