Running a series of SO2 std adds this morning and afternoon to try and equilibrate system, the 2:30 am add didn't seem to work, and the 10 & 11 am cals were different but realtively stable. I have set the cals to run again at 13:24 and 14:24 today. Once the std adds have settled down we will add the CO cal into the std add line and cal both instruments during the overnight period.
JF
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