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Equals the trace’s distance from the baseline (Baselined) or Y value (Non-Baselined) at the estimated X coordinate at the peak maximum. This is calculated using the Forward Gregory-Newton Interpolation Formula:
Take a region of a spectrum around the peak of interest at the X coordinates x0,x1,x2,x3,x4 with Y values y0,y1,y2,y3,y4, where x0 is the point just before the actual peak coordinate. Now define the first difference as:
and higher order differences as:
If the X coordinates are evenly-spaced with interval h, then the point of interest is at:
x = x0 + rh
and the interpolated Y value is given by:
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