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Fig. 3. Sample propylene density plots measured using the photoionization detector
(PID) from the centre to outside of the continuous broad plume at 50 cm from
the source. The sampling rate was 100 Hz, and the distance of the measuring
point from the centre of the plume was 010 cm. Only small concentration
fluctuations were observed within the plume. The values given by black trace
`10' reflect background (no detectable propylene) values.