[gradsusr] How to convert txt.file to ctl.file/nc.file in grads?

[syairah atiqah atiq]

Hai Grads experts,
Can anyone teach me how to convert txt.file to ctl/nc file so that I can open and analyze it using grads.Here I attach the data in txt form.
Thank you Atiqah
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Name: total ice area extent nasateam gsfc nasateam month extent  1978-2013.txt
Url: http://gradsusr.org/pipermail/gradsusr/attachments/20150610/58ef741f/attachment-0001.txt