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Twin GFs (e.g. 80/80) have the effect of artificially increasing dive time (time taken into account is greater than actual time). Using printed dive tables, it is like an "impromptu addition of extra increments of depth and time beyond those actually required by the dive, universally known as ''Jesus-factoring''"<ref name="Shields" />.
Asymmetrical GFs (e.g. 30/70) can be used to force deep stops (e.g. heliox or trimix dives when the algorithm used is not sufficiently conservative). Deep stops can be defined as follows: “one or more voluntary or empirically derived decompression stops that are deeper than any prescribed by the algorithm utilized”<ref name="Deep-Stops" />.
==Tables==
Max Hahn first used Bühlmann's algorithm to develop dive tables for the Swiss Underwater Sport Association. In 1987, the [[Sub-Aqua Association|SAA]] Bühlmann System was developed by Bob Cole. This system used the dive tables and a set of rules so that people could dive safely and stay below their [[No Decompression Limit|no-decompression limit]].<ref name="Powell2008-18" /> The tables are still used today and are very popular; many dive computers still use the ZHL-8 algorithm and many tables are based on the ZHL-16 algorithm or derivatives. These calculations also include considerations for repetitive and [[altitude diving]].<ref name="AAB1984" /><ref name="AAB1987" /><ref name="Boni1976" /><ref name="AAB1973" /><ref name="AAB1989" /><ref name="AAB1984b" />
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<ref name="Pressure94">{{cite journal |last1=Völlm |first1=T.G. |title=Leading diving researcher dies unexpectedly: Albert A Bühlmann, 1923 - 1994 |journal=Pressure, Newsletter of the Undersea and Hyperbaric Medical Society |volume=23 |issue=3 |year=1994 |pages=1–3 |issn=0889-0242 }}</ref>
<ref name="Shields">{{cite book |last1=Shields |first1=T.
<ref name="Deep-Stops">{{cite book |last1=Bennett |first1=P.B. |last2=Wienke |first2=B |last3=Mitchell |first3=S |title=Decompression and the Deep Stop Workshop |publisher=Proceedings of the Undersea and Hyperbaric Medical Society's |year=2008 |page=305}}</ref>
<ref name="spums1999">{{cite journal |last1=Wendling |first1=J |last2=Nussberger |first2=P |last3=Schenk |first3=B |title=Milestones of the deep diving research laboratory Zurich |journal=South Pacific Underwater Medicine Society Journal |volume=29 |issue=2 |year=1999 |issn=0813-1988 |oclc=16986801 |url=http://archive.rubicon-foundation.org/6003 |access-date=2009-04-02 |archive-url=https://web.archive.org/web/20120203155311/http://archive.rubicon-foundation.org/xmlui/handle/123456789/6003 |archive-date=2012-02-03 |url-status=usurped }}</ref>
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