Could someone point me, please, to something documenting the measuring of the MV slope decel time versus where to measure the half time, when the MV slope starts fast and, midway, slows so that the slope is more level?  I'd like ASE documentation, if you know where it might be.  

I know this is true, but I can't find it in my searches of all our good books or the ASE website, and I need to prove it to someone who wants to do the right thing, but needs to see it in print.

Thank you~

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