  The aim of this work is to explore possible medium modifications to the
substructure of inclusive charged jets in Pb-Pb relative to proton-proton
collisions by measuring a set of jet shapes. The set of shapes includes the
radial moment, $g$, and the momentum dispersion $p_{\mathrm{T}}$D. They provide
complementary information on the fragmentation and can help to discriminate
between two different scenarios: intra-jet broadening or collimation as a
result of jet quenching. \noindent The shapes are measured in Pb--Pb collisions
at $\sqrt{s_{NN}}$ = 2.76 TeV with a constituent cutoff of 0.15 GeV/c and jet
resolution $R=$ 0.2. New techniques for background subtraction are applied and
a two-dimensional unfolding is performed to correct the shapes to particle
level. The corrected jet shapes for jet $p_{\mathrm{T}}$ $40\le
p_{\mathrm{T,jet}} \le 60$ GeV/c are presented and discussed. The observed jet
shape modifications suggest that the in-medium fragmentation is harder and more
collimated than vacuum fragmentation as obtained by a PYTHIA calculation. The
PYTHIA calculation is validated with proton-proton data at 7 TeV.
