Raul, Sam, Carlo, Bruce, Thanks for all the messages! OK, OK, I agree: Something should be done to better use finely gridded data from continuous scan / quick-exafs collection. I'll try to post pictures of Raul's data with current and spline interpolation in the next few days. Using spline interpolation will probably be better than 3-point interpolation, but it does seem that it still may not be enough to use all the data appropriately. I'm not entirely sure what the best way to bin the data is. I would've thought a rolling average with a Lorentzian or Gaussian would be about right, but I'm sure there are other ways to do it. What are Sam and Carlo/Jeff/SteveW using? If we can agree on a best way to handle the data, I'll include this in the spline() function. If you have these algorithms in Mathematica, python, or whatever, I'd be happy to try them out. Thanks, --Matt