  Hadron multiplicities in semi-inclusive deep-inelastic scattering were
measured on neon, krypton and xenon targets relative to deuterium at an
electron-beam energy of 27.6 GeV at HERMES. These ratios were determined as a
function of the virtual-photon energy nu, its virtuality Q2, the fractional
hadron energy z and the transverse hadron momentum with respect to the
virtual-photon direction p_t . Dependences were analysed separately for
positively and negatively charged pions and kaons as well as protons and
antiprotons in a two-dimensional representation. These results will help to
constrain mechanisms and models of hadronization much more decisively than by
the use of integrated results as traditionally done. A few features particular
to the two-dimensional representation are highlighted in this contribution.
