Hi, Sorry about the preassumptions.... And , I used out.nam by mistake, instead of out.tr . I was looking at the nam output so far, ( to see the dynamics) and so by mistake used the out.nam instead. (...I was kind of preoccupied with my code :-) )..Sorry about the confusion.. FYI, I tried with out.tr , it gives the same reult even if I use GT :-).. Thanks .. - Ganesh