Hi, I have put together a figure that you will find attached with this message. The figure plots dndeta/(Npart/2) as function of the middle of the centrality bin. The red squares are the 200 GeV data at eta=0 and the blue stars correspond to same set but at 130 GeV. This way of plotting the data is an attempt to avoid using a non measured quantity in both axes. I think a number intimately related to the centrality of the collision is good because the volume of the system is the same, what changes is the available energy for particle production. I fit the 130 GeV points with a straight line and if I were to include the error bars I could get a good representation of the 200 GeV data by scaling up the fit by ~8% I think the trend we see in figure 5 of the paper is still there and once again saturation is not something that jumps at you. I would suggest we cut the discussion about fits to Npart and Ncoll because after going thru that trouble, the next paragraph is asking the reader to take the results with a grain of salt. Ramiro
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