how to calculate POP (Principal Oscillation Pattern) with NCL

Dear Madam/Sir,
How to use NCL to do POP (Principal Oscillation Pattern) analysis? Is there any example?

In the mailing list, I've got a similar thread
http://www.ncl.ucar.edu/Support/talk_archives/2009/0265.html

Thanks a lot!
Xiao

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Received on Thu Jul 1 20:41:25 2010