Hi all, Once again, I have a draft of a chapter of my textbook ready for review. This chapter is on data reduction, including normalization, background subtraction, and Fourier transforms. This will be Chapter 4 in the book, so it should be suitable for near-beginners as well as those with more experience. This is also a chapter where I had to make a lot of decisions on nomenclature and presentation, so experts might be interested as well, particularly if you have strong opinions on that kind of thing! It is a bit more than 40 pages long, which makes it the longest so far. If you are interested in reviewing the chapter and can get feedback to me by 29 September, please contact me directly at SCalvin@slc.edu . As always, repeat reviewers are welcome! --Scott Calvin Sarah Lawrence College