how to read a variable "x-wind" in a nc file with NCL

Hi There:
 
I have a nc file with a zonal wind component named as "x-wind".
When I read it in NCL as:
uu = f1->x-wind(0,0,:,:)
It had errors: fatal:Undefined identifier: (wind) is undefined, can't continue.
The "x-wind" cannot be recognized by NCL. NCL took "-" as minus or somethingelse.
Can anyone tell me how to read this data in NCL? Thanks!
 
Regards
Ed
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Received on Thu Nov 1 17:56:23 2012