Dear all Here is the printed CI vector. what does these three colums of numbers mean respectively? CI vector --------- 22+000 - -0.6874479 22-000 + 0.6874479 20-200 + -0.1173782 20+200 - 0.1173782 02+020 - 0.0551013 02-020 + -0.0551013 2-0200 + -0.0530552 2+0200 - 0.0530552 thank you best regards xj liu