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    User name A. Deur

    Log entry time 11:09:38 on August26,2003

    Entry number 113603

    This entry is a followup to: 113590

    keyword=yt shoulder

    The peak at large y_t is also visible for He3 cell runs, see fig 1 (it is in log scale) where it appears as a small shoulder. During beam study, we had a look at the collimators or anything that could be in the beam path and we did not see anything wrong, see Jian-Ping entry.
    The contamination from the empty ref cell is very small anyway: 0.4% after online replay cuts.

    FIGURE 1