Y beam position is calculated by the following formula. (H00B.YPOS-H00A.YPOS) Y_bpm = ----------------------- * (Z_bpm - H00A.ZPOS) + H00A.YPOS (H00B.ZPOS-H00A.ZPOS) where Z_bpm is 0 at the Target position. Figure 1 is Y beam Position VS run number.