All you need to do is measure the raw size of your paper and weigh it. Area / Weight = Area per unit Weight (m

^{2}/N). Now you know what the specific weight of your paper is. Plot your curve and cut out along the curve, down the Y axis, across the X axis to your limit and then straight up parallel to the Y axis. Weigh this portion of paper on a analytic balance. Area per unit Weight x Weight = Area.

If your limits of integration do not start at zero, just cut parallel to the Y axis where your limit begins.

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