Wavelets and time

Hi all-
I am learning how to use the wavelet script along with a wrf idealized model
run.
My question concerns the use of a variable and its association with time as in
the following from the wavelet_1.ncl script:

power&time = time

What does this statement actually do?

Is "time" supposed to be defined in the netcdf file as an attribute?
Thanks for any insight.

-- 
James Correia Jr.
Ph.D. Candidate in Agricultural Meteorology
Former President: ISU Graduate Meteorology Club
Dept. of Agronomy, Iowa State University
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Email: jimmyc_at_iastate.edu
Phone: 515-294-9870
Web: http://bruce.agron.iastate.edu/jimmyc/
ISU GMC: http://www.stuorg.iastate.edu/gmc/
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