From the complete hysteresis data, copy the data from pmax (Emax) to pr(E=0) and paste in origin worksheet. Similarly copy the data from pr=0( Ec) to pmax (Emax) and paste it on another columns of the same worksheet. Draw the graph with these data. Hysteresis loop in first quadrant will be obtained.
Go to gadgets -integrate, from the pop up window click on baseline - data set-Add plot 2. Adjust the width of the box which appears now, Area of the selected region between the two curves will appear on screen.