Sales of stored West Texas Intermediate crude at Midland,Texas,in light of a narrowing prompt cash crude contango,weakened Midland WTI differentials against Cushing WTI Wednesday,market sources said.July-delivery Midland WTI traded steadily lower from parity to cash WTI down to WTI minus 9 cents/barrel.The grade was last quoted at WTI minus 10 cents to minus 5 cents/b.It was assessed Tuesday at a 7 cents/b premium.
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