SGP/PGS/C1 - Reprocessing User Notes

Time Variables - to make the PGS system more consistent with LBNL's other data streams, 
the variable 'yyyymmddhhmmss' was renamed 'yyyydddhhmmss'. Also, at the bottom of each 
file, variables 'yyyy','mon','hour','min' were added for those users who prefer to use these 
variables instead. The new 'time' variable (seconds since midnight of the start of file) 
was added to make files compatible with the new recommendations.

Quality Control Flags - to prevent confusion, the quality control flags 'qc_co2ppm' and 
'qc_sum_co2' were combined. The flag 'qc_sum_co2' was elliminated and 'qc_co2ppm' now 
performs range checking on 'co2ppm' variable as well as checking values of all dependencies' 
qc flags.

Data users should take note of the changes. Specifically, any old code used to 

process the data should be updated to correctly parse the new 'yyyydddhhmmss' variable as well 
as no longer use 'qc_sum_co2' variable.

• site_longitude
• coeff3_se
• coeff1_se
• t_refrig
• channel
• pres2
• pres1
• pres4
• co2mv_slope
• r2
• pres3
• coeff3
• coeff2
• coeff1
• pres_ctrlr
• co2mv_slope_pval
• iso
• site_latitude
• co2ppm
• co2mv
• reject_flag
• coeff2_se
• ref
• warn_flag
• site_elevation
• flow_rate
• co2mv_se
• yyyymmddhhmmss
• co2mv_slope_se
• t_irga
• nmeas
• adj
• co2ppm_se
• base_time