Trouble in writing .nc

Hi
here is my script:
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"

begin

input = addfile("/Users/Bertu/Downloads/temp.nc", "r")
vair = input->air
;time = input->time
xAir = month_to_season12 (vair)
system("/bin/rm -f output.nc")
output = addfile("output.nc", "c")
filedimdef(output, "time", -1, True)
;output->air = vair
vair!0 = "lon"
vair!1 = "lat"
vair@lon = xAir&lon
vair@lat = xAir&lat
vair@long_name = "Seasonal Average of Temperature"
vair@units = "deg C"
output->xAir = xAir

end

can you tell me what's wrong?
It's supposed to work but it's only writing the same data with the new name.
Thanks

-- 
Norbert Bonnici

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Received on Mon Sep 13 22:52:10 2010