non linear time ctl template

[claudio cortes]

Greetings...!!!

I have a set of grib files like this:

gribfile00.grb ----> analysis
gribfile06.grb ----> forecast for the next 6 hours
gribfile12.grb ----> forecast for the next 12 hours (diffrence with
the last file: 6 hours)
gribfile18.grb ...
gribfile24.grb ...
gribfile30.grb ...
gribfile36.grb ...
gribfile42.grb ...
gribfile48.grb ...
gribfile60.grb ---> forecast for the next 60 hours (diffrence with the
last file: 6 hours)
gribfile72.grb ---> forecast for the next 72 hours  (diffrence with
the last file: 12 hours)
gribfile84.grb ---> forecast for the next 84 hours  (diffrence with
the last file: 12 hours)
gribfile96.grb ...
gribfile108.grb ...
gribfile120.grb ...

How can I create a one template ctl file for this non linear time
dataset...?, because the difference in hours in the first 9 files are
6 hours, but in the next 6 files the difference is 12 hours... or I
can't...?

--
Claudio Cortes
Meteorologo
Laboratorio de Meteorologia y Calidad de Aire
Centro Nacional del Medio Ambiente (CENMA)
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Claudio Cortes
Meteorologist
Meteorology and Air Quality Labs
National Enviroment Center, Chile (CENMA)