Group, I have recently compiled a model that gives excellent visual fits in R, q, and k space. This model also bond spacings that make sense, and are very close to what would be expected from this set. The R factors are very low, and the enot values correspond quite well to the edge. However, our amplitude values are much larger than typically expected. They come in at the range of 1.8 up to 5.0, but only on a few data sets. On all the rest the amplitude values are 0.4 to 1.0. Could this increase in amplitude be attributed to the fact that we ran florescence measurements instead of transmission? What else could be causing this in only one data set, where they all have the same structure. Thanks in advance to any replies, your help and time is appreciated. Gavin gavin_garside@yahoo.com