read multi data files

[Menglin Jin]

Hi,

I use the following .ctl file to read July data from 1982-1999, and the
data files' names are "82.07.***", "83.07.**8"...
  dset ../data/%y2.07.tau.grads
  options template
  undef -9.99E+33
  xdef 360 linear -180.000 1.00
  ydef 180 linear -90.000 1.00
  zdef 1 levels 1000
  tdef 15 linear 00:00Z01jul1982 1mo
  vars 1
   aod 0 99 MODIS product
  endvars

But I run into error message when I read it in grads:
  Low Level I/O Error:  Read error on data file
   Data file name = ../data/%y2.07.tau.grads
   Error reading 360 bytes at location 64800

Each data file itself is good, as I can plot it by reading in
each file separately. Caould anyone give me some suggestion? Many thanks.

ML