[gradsusr] opening a SOI or SAM netcdf file using grads

[Malcolm Tang]

Hi,

I have downloaded a Southern oscillation index(SOI) netcdf file, and it has
only 1 dimension (time).

When I tried open it using "open" command, it says there is "unknown
keyword in description file", when I tried open it using "sdfopen" command
it says there is no discernable X coordinate.
And since it doesn't have x or y coordinate, how should I write a
descriptor file so I could try open it using "xdfopen" command?

Can anyone please advise?

Regards,
Malcolm
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