Hey everyone, I'm hoping I can get some input on this. As some of you may recall, I'm currently in an internship at Fermilab, and I've hit a snag in plotting my data. I'm measuring the intensity of the NuMI neutrino beam at multiple different points to look for discrepancies in the measured intensity and plotting them graphically. Essentially I'm taking the measured intensity and creating normal distributions, then finding the difference between the normal distributions and plotting the differences as normal distributions. I'm good up to this point, but now I need to take these differences and fit them to a Gaussian Distribution. This apparently isn't something that Excel has built in, but can be done using the proper procedures. I've been following http://homepages.gac.edu/~smiller3/courses/371-f14/fitting.pdf [Broken] which has worked very well up to a point. I'm stuck on step 8. I'm trying to optimize the distribution using the Solver function in Excel 2013, and I keep getting a division by zero error for my R² value, and I can't figure out why. Could anyone provide some input or direct me toward a better tutorial for doing this? It would be very appreciated!