EOF output normalisation
In an Empirical Orthogobal Function (EOF) decomposition the normalisation of the EOF maps and PC time series in arbitarry. Consider the definition

E(x,t) = ∑i=1N Ei(x) pi(t)

One can multiply the EOF Ei(x) by an arbitrary factor A as long as you divide the time series pi(t) by the same factor A.

You can choose between four normalisation schemes.