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congrats, i use the andi standard po2 of 1.45 and 1.6 for my deco. btw sheck exley used a working po2 of 2.0 il say it again nitrox is the best underrated course i have ever taken. it really does give you an extra window and when used wisely can extend bottom times, lower si's and as chip put it, "Tastes like the bottom froth of a vanilla milkshake"