Data from 19 test runs covering a total of 15 vessels at three mills is shown in the figures discussed here. This data has been screened to exclude results for vessels which are known to suffer from streamside tube fouling, and for cases of two-vessel effects. The latter situation is abnormal if juice feed is in series since there is no flash in the second of the pair, and if juice is fed in parallel then there is a problem with quantification of the feed split and hence determination of evaporation rates. A few more results were rejected because of suspected dilution or contamination of juice samples.