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harmonic analysis



Dear ferret users,

   I am performing  FFTA and FFTP of a SST monthly time
series(12 datas in time)in ferret. Then I am trying to reconstruct
the original SST time series. I am getting ~-45 deg lag in the
reconstructed SST. cane somebody can give some help to to solve
this.

At the same time if I use daily data (365 pts in time) is
working fine.

Thanks in advance.

Cheers,
Ramesh
****************************************
K.V. Ramesh,
Scientist "C",
Indian National Centre For Ocean Information Services (INCOIS),
Hyderabad,
Andhra Pradesh, India.
Pin Code:500033
mail:ramesh@incois.gov.in,kvram55@yahoo.com
*************************************

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