Hello. I have a question. I remember reading the e-mail about ZDC_Vertex do not have Multiplicity dependence. Well, I think it is there. Look at the figure "ZDC_TPM1_vertex.ps" in "http://pii3.brahms.bnl.gov/~hito". The figure is produced from run 2336. In this figure, the vertical scale is ZDC vertex - TPM1 (cluster) vertex, and the horizontal scale is BB Mult. Of cause, it is possible that BB Mult is wrong. But, if I use other mult such as Si and Tile mult, I see the same thing. Furthermore, I do not see this much dependence from BBVertex - TPM1 Vertex although BBVertex have other problem. Can someone look at this? The fix is needed since multiplicity in Si can easily is affected by 3-4 cm shift of vertex. Until it is fixed, I will manually (in my own code) fix ZDCVertex to align to TPM1 vertex. Hiro
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