Below are 3 correlation matrices for track/pi0 cluster variables.  The matrices are formed from

1. The signal sample.
2. The W+jets sample.
3. The difference between the signal and W+jets correlation matrices.

Notice that the signal sample matrix is more anti-correlated across all variables than the W+jets sample.  All variables exhibit |rho|>10% for all combinations, i.e. there are no highly uncorrelated pairs of variables.

–Dan