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I know it shouldn't happen but it does:

Some mixes take time to mix properly unless you roll the cylinders or turn
them upside down a few times. It's never a problem with blends in the
bottom mix range -- those come out right immediately. However, high oxygen
mixes don't show their true colors until you roll the cylinder. I assume
that air trickling in slowly at the end of a fill stays on top for a while.
For nitrox we're talking gases of similar density and freshly pumped
compressor air will tend to be warmer, thus slightly lighter. As the final
flow of gas seeps in on top it will tend to stay there, mixing slowly
unless agitated. Still, we may all agree that once mixed there's no way
gases will layer -- entropy works in our favor over time!

regards,
Hans 
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