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Uses the Trapezoidal Rule using the absolute value of the regions between the baseline and the curve. Values are determined both before and after subtracting the baseline.
Let l = the point number (index) of the left limit of the integration range r = the index of the right limit of the integration range
x = the X increment between data points base(x) = the baseline
If the baseline is subtracted from the curve, then y = y - base(x) the Area is then given by:

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