Taylor diagram - about "ratio"

Hi,

I am doing a Taylor diagram for the first time. My problem is about "ratio".

The definition is:
    ratio: Case_Variance/Reference_Variance

And in "taylor_1.ncl<http://www.ncl.ucar.edu/Applications/Scripts/taylor_1.ncl>:
Default Taylor diagram", it tells:
    All ratio values must be between 0 and 1.65
 I want to known why it is 1.65? If i calculate ratio bigger than 1.65, is
it reasonable?

Thanks

-- 
Sincerely,
Ning Cao
School of Earth and Space Sciences
University of Science and Technology of China
96 Jinzhai Road, Hefei, Anhui, 230026
P.R.China
Tel£º+86 551 63607953

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Received on Wed Nov 6 20:26:30 2013