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The effect of changing the tube lens offset from 0V to 30V on the [M+H]+ and [M+Na]+ ions for SM (d18:1/16:0). The capillary temperature was held at 250°C for each voltage level. At the lowest tube lens voltage, fragmentation of the parent ion is still around 50%. Adjusting only the tube lens offset is not enough to limit the fragmentation. The sodiated species appears to be unaffected by a change in the tube lens offset.
