1. The optical fractionator uses a constant characteristic value for each site. 2. The optical fractionator , and other sampling methods, has some statistical uncertainty. 3. The oil then passes to a fractionator . 4. The proportionator is related to the optical fractionator and physical dissector methods that also estimate population. 5. The optical fractionator is the defacto standard for estimating the number of cells in an unbiased manner. 6. The optical fractionator is the older standard for estimating the number of cells in an unbiased manner. 7. As part of the project, Texaco will rebuild a natural gas liquids fractionator at Paradis, La. 8. If there is no difference between sampling sites, then the proportionator behaves the same as the optical fractionator . 9. This method is related to the optical fractionator and physical disector methods that employ a systematic uniform random sampling process. 10. The crude oil fractionator does not produce products having a single boiling point; rather, it produces fractions having boiling ranges. 
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