Dear Bjorn,
           I think that making dt = t_left - t_right is more logical since
it will be positive for positve Z.
                      Yours Michael
: 
: Michael Murray murray@comp.tamu.edu
: Cyclotron Institute, Texas A&M University, TX 77843-3366
: Telephone (979) 845 1411, FAX 1899
This archive was generated by hypermail 2b29 : Fri Sep 01 2000 - 15:11:26 EDT