Owen Duffy wrote:
There are different criteria proposed by different people for the instant
that divides two cycles.

Which presupposes that an instant actually divides
two cycles. :-) My 130/85 blood pressure used to
be normal for my age. Now that exact same blood
pressure is pre-hypertensive even though I'm 20
years older. I've concluded that human concepts
create reality, not vice-versa. :-)
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com