  The $p_\perp$ dependence of the nuclear modification factor $R_{\text{AA}}$
measured in PbPb collisions at the LHC exhibits a universal shape, which can be
very well reproduced in a simple energy loss model based on the BDMPS
medium-induced gluon spectrum. We update a former study by including in the
analysis the recent CMS measurements on $J/\psi$ production in PbPb collisions
at $\sqrt{s}=5.02$ TeV and charged hadron production in XeXe collisions at
$\sqrt{s}=5.44$ TeV. The average parton energy loss extracted from minimum bias
XeXe collisions is reduced typically by 20% compared to PbPb collisions,
consistent with a length dependence $\langle\bar{\epsilon}\rangle \propto
L^{1.3\pm0.5}$ with $L\propto A^{1/3}$.
