I have written a draft Excel spreadsheet for calculating fills for bottom mix trimix. You put in your desired depth, maximum pp(O2), desired amount of narcosis. It calculates the percentages of helium, oxygen and nitrogen; the pressures of helium, oxygen, and air to add to a tank to get that mix; and the fraction of oxygen to test for after adding the oxygen to the helium, and after adding the air. I would appreciate comments and feedback, especially about my assumptions. They are all documented in the spreadsheet. They include that oxygen and nitrogen are equivalent in narcotic effects - I know that until recently people have assumed that "nitrogen narcosis" is purely due to nitrogen, when calculating mixes. To extract, use uudecode, and then pkunzip. --------------------------- cut here -------------------------------- begin 644 mix.zip M4$L#! H & "1@GA*\MPX +\> ' 34E8+EA,4P\ $@,D%38G M.#EJ>TR=;A\)!@$3-.7VEO<3$C10[! !.D7(%2!(@!*-II4[ERY(H6^(?^L6 MY-"W<N&Z! 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