I have some data and in said data I had 2 peaks, to which I fitted 2 Lorentz functions. The sum of these 2 functions gives me a 3rd function. Now, I need to find the integrated area of the 3rd function. Originlab gives me the area of the 2 fits, but not of the 3rd function. Summing the area of the 2 fits should give me the area of the 3rd function. However, I'm not sure it does because the 2 fits go below negative (so, an integration would be summing negative numbers to positive numbers). So the question is: - Can I sum the 2 areas in order to get the cummulative area? Does Originlab 9 give me the mathematical area or the absolute area? I didn't find anything about this whatsoever. Thanks in advance!