The QCLS in a GV rack as installed for flight.
in-flight calibration uses standards carried in gas cylinders
Time series of QCLS measurements of CO2 (left) and CO (right) compared to "classic" measurements (from the Harvard OMS instrument) and to the NCAR CO instrument. Also shown are the corresponding measurements of N2O and CH4. The sawtooth gray lines show the measurement altitude in reference to the scales on the right sides of the graphs.
Harvard University