| Imported post
Herewith a (much) shortened explanation. Slow tissues, fast tissues.
Descend, both gas in.
Ascend, both gas out - to different percentages (slow in = slow out etc).
Re-descend, both gas in BUT faster tissues accept gas from both the re-descent pressure and the slower tissues (cos they're still gassing out to the faster tissues, but also back in to themselves).
Saturation of faster tissues faster, off tables, customer.
I'll let you follow the graphs of gas in/out times for 12+ tissue groups on multiple ascents yourself.
OK?
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