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    User name Z. Chai

    Log entry time 00:18:29 on June10,2000

    Entry number 43299

    keyword=Rate comparison between open and 6msr coll.

    Run 1852 with 6msr coll. in both arms, good events ( with proton, tc_cor, vertex difference, m_miss cut) rate 8.3Hz.

    Run 1857, both arm open coll. Good event rate 10.2Hz.

    Rate increase 23% after taking out the collimator.