Hi Walt, I am pretty sure we decided not to make the sign flip signs align for concurrent B2/Keck scansets. Given the weight balancing that is already done this seemed one constraint too many. Stefan will remember more clearly. The fraction of concurrent scansets is pretty small isn't it? 2012 only and not all of those... Clem -- ********************************************************************** Clem Pryke - Associate Professor - Physics University of Minnesota, Room 313 Tate, 116 Church Street S.E. Minneapolis, MN, 55455 Tel: 612-624-7578 Fax: 612-624-4578 email: pryke(a)physics.umn.edu **********************************************************************