Fig. 5

Comparison of statistical hit-finder against ion based hit identification using a time-of-flight detector (ToF). a shows a density plot (darker blue implying higher density) of the normalized score distribution of all shots. The green line is the threshold defined by our statistical hit-finder, and whatever is above is considered a hit (blue circle outlines). ToF hits are also shown (red). b shows the average of 56 ToF non-blank traces that are not statistical hits (blue line) and a corresponding number of ToF hits that are statistical hits as well (red line). In the latter, the wide drift-mode proton peak is visible ~ 800 ns