Problem with add_offset and scale_factor

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Hi all,

I'm a beginner with NetCDF and NCO.
I have several files 1990.nc, 1991.nc ..., each of them containing annual 
data jan, feb, ..., dec.  I want to calculate the climatology, but using 
ncea gives me a file with something that is not the arithmetic mean of the 
individual files.
After some inquiries, I think this is due to the fact that each input file 
(variable type is short) as a different add_offset and scale_factor.
Using ncea seems to attribute to the ouput file the add_offset and 
scale_factor of the first input file.

Does anybody know how I can proceed to get the correct climatology ? Is it 
possible with ncap ? How should I use it ?

Thank you very much for any help !
All the best
Laurent
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