Nuclear modification factor, RdAu, at 4 values of centrality as a function of transverse momentum.  The quantity RdAu is the ratio of the yield observed in d+Au collisions divided by the yield in p+p collisions and also divided by the number of nucleon-nucleon collisions predicted by a Glauber model.  The vertical bars (brackets) show the statistical (systematic) uncertainties in the individual points and the shaded bands show the systematic uncertainty in the overall scale.  The solid line in the lower right panel shows the same result for central Au+Au collisions.  Note the drop at high transverse momentum that is present in central Au+Au but absent in d+Au.