Multiple Channels xcorr: indices of the couple of signals that gives me the higher correlation?

Dear Users,

I have 36 time-series and I would like to find which couple has the higher correlation. I am using the xcorr function and from the help I know that if S is a three-channel signal

S = [s1 s2 s3] then the result of xcorr(S) is organized as

R = [Rs1s1 Rs1s2 Rs1s3 Rs2s1 Rs2s2 Rs2s3 Rs3s1 Rs3s2 Rs3s3]

So, how can I find the indices of the couple of signals that gives me the higher correlation?In other terms, how can I identify the more correlated couple among a set of signals?

Thank you in advance, fab