gas mixture for june test run

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I compared the drift time spectra from June test runs with the Garfield
simulation. The maximum drift times for ALL three regions are longer
than simulation results using a 90/10 Ar/CO2 mixture. The results
are more closer to the results of a 80/20 mixture. We may want to
have a gas sample analyzed to make sure what the mixing ratio is.

Regards,
Liming Qin

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