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	re N2 precipitation threshold;

	We've had various 'examples' given, some of which pertain to be
accurate (ish). From a ratio of 2  through 1.7 to 1.58.

	Also a set of USN figures.

	Having fiddled with these numbers it seems (in the absence of
any fiddle factors and knowing whether the numbers are designed for
sequential compartment loading, or parallel loading) that the USN fudge
of different critical ratios for different tissues is very important to
avoid exceeding the ratio, particularly in the 10-15min compartment.
Using the USN numbers tho' it seems impossible to exceed the critical
ratio! I guess they're for soldiers (poor buggers).

	Halving the USN ratios starts to mimic some table numbers. Now I
don't maintain that any of what I've done is at all applicable to the
physical world - I'm just trying to get an emotive feel for what's going
on in your body under air pressure. What are the other *important*
factors involved in predicting bubble precipitation in this kind of
model (as opposed to DCS prediction - and microbubble theory etc).

	Unless we get some idea of these factors, and which
'compartments' are felt to be the critical ones in various DCS cases,
then swapping ratios doesn't get us anywhere.

	Jason. 

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