Figure 4From: Seven Golden Rules for heuristic filtering of molecular formulas obtained by accurate mass spectrometryFrequency distribution for 1,200 randomly selected molecules downloaded from the Dictionary of Natural Products at < 2000 Da and comprising C, H, N, S, O, P, F, Cl and Br. Left panel, 4a: mass distribution. Middle panel, 4b: simulated measured masses at 3 ppm mass accuracy. Right panel, 4c: simulated measured isotope ratios at ± 5% accuracy.Back to article page