Nuclear modification factor (p0): √sNN dependence

• CERN-SPS: Pb+Pb central (√sNN = 17.3 GeV): no suppression(*) (within errors)

• CERN-ISR: a+a (√sNN = 31 GeV): Cronin enhancement.

• RHIC: Au+Au (√sNN = 62, 130, 200 GeV): x3 - x5 suppression.