SGP/PGS/C1 - Incorrect 60m Data

Precise Gas system (PGS) data at 60m (channel 4) are incorrect. This problem is due to a 
freezing rain and ice storm that hit SGP Central facility on January 5, 2005. The 60m 
tower inlet was clogged with ice and consequently, no air was supplied to the PGS instrument.

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• calculated concentration of CO2(co2ppm)
• reading of CO2 in mV(co2mv)
• pressure inside the IRGA box measured by the pressure controller(pres_ctrlr)
• p-value of co2 readings during the last 30sec of 3min period of raw data(co2mv_slope_pval)
• flow rate measured by the mass flow controller(flow_rate)
• Pressure of channel 4(pres4)
• Slope of CO2 readings during last 30sec of 3min period of raw data(co2mv_slope)
• 90% confidence limint of co2mv_slope(co2mv_slope_se)
• standard deviation of co2mv(co2mv_se)
• 90% confidence limit of co2ppm(co2ppm_se)