concatenation of files

[Arlindo Meque]

dear all,

i downloaded four files of GFS (grib format) model: 00h, 06h, 12 and 18hr


and i would like to concatenate all file as one, please see the attachement. I have created a  ctl file but it works only for the firts time (00h) but when a try to display for 06h it does not works.

Can anyone help me please?

Arlindo 


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