Basically it's cheating...
The design accepts that air will be in the shock, and thus through the action of the shocks will be distributed as tiny bubbles in an oil and air emulsion.
Result is consistent damping throughout the travel of the shock, just like it would be if there was no air in it at all. But the action will be slightly lighter than just the oil on it's own.
That's how I understand it anyway, might be wrong...
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