Tuesday's Big Rally: $4 Billion in E-mini CoveringNov. 15, 2006 3:47 AM ETby: Barry RitholtzBarry Ritholtz Follow Send MessageI've checked the grapevine, and have it on fairly good authority: Tuesday's explosion was caused by a covering (or unwinding of) 122k E-mini SPX contracts. That's a notational value of $4B. Someone's stop loss got triggered big and ugly . . .