Dear Hiro, you plot looks very nice. The largest asymetry I could see was 30/640 or about 5%. This reminds me of the STAR pbar/p ratio vs Y was also not symetric in a small rapidity interval around y=0. If you symetriced the distributions by averaging positive and negative rapidity one could say that you have an additional systematic error from this unknown cause of 2.5%. Yours Michael Michael Murray, Cyclotron TAMU, 979 845 1411 x 273, Fax 1899
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