  A measurement of the splitting scales occuring in the $k_\mathrm{t}$
jet-clustering algorithm is presented for final states containing a $Z$ boson.
The measurement is done using 20.2 fb$^{-1}$ of proton-proton collision data
collected at a centre-of-mass energy of $\sqrt{s} = 8$ TeV by the ATLAS
experiment at the LHC in 2012. The measurement is based on charged-particle
track information, which is measured with excellent precision in the
$p_\mathrm{T}$ region relevant for the transition between the perturbative and
the non-perturbative regimes. The data distributions are corrected for detector
effects, and are found to deviate from state-of-the-art predictions in various
regions of the observables.
