Table 2.

Definitions of fiducial point detection techniques (FPDTs).

FPDT	Fiducial Point Definition
Peak	The maximum point in each BBI.
Valley	The minimum point in each BBI.
M1D	The maximum point of the first derivative in each BBI.
M2D	The maximum point of the second derivative in each BBI.
Tangent	The point where the tangent line from the M1D intersects the horizontal line from the Valley. The first derivatives of a discrete data set are determined by the difference function approximation.