A snapshot of the average of all supplier postings in each OPIS rack market at 4:59 p.m. ET. The snapshot includes all price moves from 6:00 p.m. ET the prior day until the price file is frozen by 4:59 p.m. (Example: The January 8th Closing Average encompasses all price moves that were made at 6:00 p.m. ET. January 7th up until we freeze the prices no later than 4:59 p.m. ET on January 8th. It does not include any price moves made at or later than 5:00 p.m. ET on January 8th.)
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