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21/25 mix for an END of 30m at max depth 50m

I get an END of 35m for this one, and 41m for the other one.

If you do the calcs using just N2, they're still off by a little.
 
Sorry for jumping in, but as Mark is my instructor (for upcoming courses), and I do look up to him as someone i would like to be like, i only see it fair to stand up for him... unless one has personally read Marks book, and Talked to him, they would not fully grasp his way of going about things, when i talk to Mark for me its obvious to see that he is more knowlagable then any tech instructor i have met... And there are many other reasons i look up to him
 
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