  We study the pion distributions in jets produced in heavy-ion collisions in
association with trigger particles restricted to definite momentum ranges. We
determine the centrality dependence of the associated particle distributions
for both d+Au and Au+Au collisions in the recombination model. The
central-to-peripheral ratios show significant dependence on centrality for
Au+Au collisions, but negligible dependence for d+Au collisions. The results
are in agreement with the qualitative features of the data.
