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How can you go and determine the correlation matrix between each of their NPs?

so for example if you have (let's say roughly) 3 systematics: TES, JES , JER (tau/jet energy scale and jet energy resolution), how could you make a table that hase:

\begin{tabular}{c|c|c|c}

TES JES JER

TES

JES

JER

\end{tabular}

and entries the correlation coefficients [itex]\rho \in [-1, 1][/itex]?

Of course the diagonal will have +1 ...