Large pieces of Enron's bank debt were said to have traded this week with more than $70-80 million in paper changing hands. Market players said the company's 364-day credit traded in the 15-16 range with a European bank rumored to be the seller. Traders said the paper moved because the levels had ticked high enough for the bank to want to unload some of its exposure. Raymond Bowen, Enron cfo, could not be reached by press time.