Rule of thirds for bottom gas only. If gas consumption between divers is the same, then for deco gas rule of halves (50% for own use 50% backup). This way you can get your buddy out if he/she has a complete deco failure even at the begining of deco. Nick -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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