"Table 185" of "Properties of jet fragmentation using charged particles measured with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV"

The total uncertainty covariance matrix for the number of tracks. The first half of the bins on a given axis correspond to the more central jet while the second half correspond to the more forward jet. See Fig. 4 in the paper for more information about the binning. The covariance matrix is the sum of the covariance matrices for each source of systematic and statistical uncertainty. Note that the overall sign for the systematic uncertainty covariances is arbitrary.