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64 were then scanned successively 20 times.18 At least 10, and almost always 15-20 scans were used in each calculation. The m/e 62/64 ratios use each peak twice: a given peak is compared both with the peak preceding and the peak following. This procedure minimizes the effect of the slow decrease in peak height resulting from sample depletion. Standard deviation of the mean for the ratios usually ran around 0.05-0.1 %, and never above 0.15 %.(18) Though the instrument is capable of simultaneous collection, the dual collector available for this work would have collected m/e 62 and 63 together, and m/e 63 contains both S32 and S34 species.

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