Time problem

[Cottet, Loic (IFPRI)]

Hi,

I am trying to operate a difference between 2 files,
when it comes to be the same time it is done easily but when I want the
difference over a long period of time it is not done.

ga-> d mrso.3(t=1) - mrso.1(t=1)
Contouring: -3500 to 0 interval 500
ga-> d mrso.3(t=1,t=1200) - mrso.1(t=1,t=1200)
Syntax Error: Invalid dimension expression
  Same dimension specified multiple times for variable = mrso.3
  Error ocurred at column 1
DISPLAY error:  Invalid expression
  Expression = mrso.3(t=1,t=1200)-mrso.1(t=1,t=1200)


can anyone help me?

Thanks a lot,