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If your initial data to be integrated contains a baseline (usually constant or linear), you might to subtract it from data before integrating. The constant baseline will result in linearly growing integral.
In such case the algorithm may be the following:
Line Fit Curve. You may specify you own equation (Pro only)
Baselinecheck box in curves list
Processing → Integrateto integrate the data without baseline
To perform integration you should specify two columns: x and y. Missing values are ignored.
MagicPlot uses trapezoidal rule to compute the integral: