ure 4: integrated ethane-bas d US ethyler HOPE margins, 2002-WE fen') 40 30 20 10 0 (10) • Ethylene Cash Margin (Ethane Feed) HOPE Margins Twee DC agony" Oeuscn• U.S. ethylene producers have substantially increased their usage of less expensive NGLs For U.S. chemical producers, the widening s