This experiment was the 3rd analysis of a drilled sample from Mars. It is known as John Klein 3. It revealed the continued presence of the derivatization reagent, N-methyl-N-tert-butyldimethylsilyl- trifluoroacetamide (MTBSTFA), in the sampling handling system. A boiloff protocol was utilized at the start of the experiment to drive off compounds derived from MTBSTFA before most volatiles were evolved from the sample. For estimation of abundances of volatile compounds detected in EGA, the background was subtracted as a constant value, typically early in the run. Exceptions to this were O2 and CO2, for which the background was modeled as trending downward during the run. Uncertainties in abundances, deriving from statistical noise, background subtraction, calibration factors, assumptions regarding ionization cross-sections for the relevant compounds, and isobaric interferences, are estimated at 10-20% of the values. This run analyzed a triple portion compared to the nominal SAM experiment.