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Fig. 4 | BMC Chemistry

Fig. 4

From: Evaluation of an online, real-time, soft-photon ionisation time-of-flight mass spectrometer for mainstream tobacco smoke analysis

Fig. 4

Individual moving range control charts for toluene yields (μg/puff) from the highest gas concentration (99.5 ppm). a Top, individual measurements for all data points (n = 120). Bottom, difference between two consecutive data points (moving range). b Variability in repeats per analytical run (n = 10). The charts in a were broken down into 12 sections with their own upper and lower control limits as indicated by the dotted lines. Top, individual measurements; bottom, difference between two consecutive data points

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