"All channel all year background covariance matrix" of "Search for heavy neutral resonances decaying to tau lepton pairs in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

Covariance matrix for all bins and all channels used in the background-only fit of this analysis. There are the e-tau, the mu-tau, and the tau-tau analysis channels, each present for 2016, 2017, and 2018. Each has 6 bins in the reconstructed mass (mrec[GeV]) indicated with their borders in the bin naming. The bin labels have channel name, year name, then bin name.