Volume mixing ratios for this experiment were computed from unit scan
data. The background was taken as a constant value computed from the
average signal between 5161 and 5312 sec. A background of zero was
assumed for m/z 32.
The csv file containing compositional information includes two sets of
mixing ratios. The first one, labeled initial CO2, etc., estimates the
composition of the gas in the system when the valve connecting the QMS
to the manifold was first opened. The system contained residual gas
from pre-launch calibration, which contaminated measurement of the
martian atmosphere in this run. For this reason, no isotope ratios were
computed for this experiment.
The second set of volume mixing ratios was computed from the final
portion of the experiment, after most of the residual calibration gas
had been expelled from the system.
Uncertainties were computed by propagation of the standard deviations of
the averaged unit scan data through the volume mixing ratio calculations.