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Open Table or Figure or Fit Plot with initial data and select
Processing → Integrate menu item.
If your initial data to be integrated contains a baseline (usually constant or linear), you may want to subtract it from data before integrating. (A constant baseline will result in linearly growing integral.)
In such case the algorithm may be the following:
Baselinecheckbox in curves list
Processing → Integrateto integrate the plotted 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: